new cbs news poll shows hillary clinton opened a seven-point lead over donald trump since the democratic convention last week. clinton 46%. trump 39%. trump is under fire from both democrats and republicans over of a fallen american war hero. here is major garrett. donald trump, you are asking americans to trust you with their future. let me ask you -- have you even read the united states constitution? >> reporter: that challenge issued by the father of fallen army captain has cast a lingering shadow over donald trump's presidential campaign. trump questioned the right of khan to criticize him and >> she was standing there. she had nothing to say. she probably maybe she wasn't allowed to have anything to say. >> reporter: earlier in the campaign. >> i like people that weren't captured. hate to tell you. >> reporter: trump refused to back down from criticism of arizona senator john mccain, who today said becoming the republican party's nominee did not give trump an unfettered license to defame nez who are the best among us. >> president obama also weighed >> as commander-in-chief, i'm pretty tired of some folks trash talking america's military and troops. >> at arlington national cemetery we met the dowels there to visit a family member's grave but were drawn to captain khan's resting place. jake dowel said trump wronged the khans. >> donald trump is trying to take away the power of the situation and amazing sacrifice he made and bravery both parents >> tony dowel said trump set the controversy in motion long ago. politicalization of this, began with mr. trump attacking people of the muslim faith. he has been doing it for a year. >> it deeply saddened me. >> carlean cross, a gold star mother whose son jason died in this 2008 battle in afghanistan described how she and other gold star families feel blindsided by trump. >> but at least honor, honor the family. honor that ultimate sacrifice. and i think gold star families are confused, you know, that this could actually even be spoken from someone aspiring to be president of the united states. >> reporter: the veterans of foreign wars said it will not tolerate anyone berating a gold star family member for exercising his or her right of speech. and charlie, our latest poll shows 63% of those surveyed do not believe trump has the right temperament to be president. >> new questions are being raised about hillary clinton's truthfulness after an interview that aired yesterday. nancy cordes has that. >> we are not going to let it happen. >> reporter: donald trump is typically the one who runs afoul of fact checkers. but clinton's answer to a question on fox news sunday earned her four pinochios from "the washington post," the question about her use of a private e mail server. >> fbi director james comey said none of those things you told the american public were true. >> director comey said my answers were truthful and what high said is consistent with what i have told the american people. >> comey did testify clinton was truthful to the fbi but not necessarily to the american people. >> secretary clinton said there was nothing marked classified on her e-mails sent or received. was that true? >> that's not true. there were a small number of portion markings on three of the documents. >> secretary clinton said i did not e-mail any classified there is no classified material, was that true? >> there was classified material e-mailed. >> according to a new cbs news poll, the democratic convention did give clinton a five-point bump in percentage of voters who find her honest and trust worthy. charlie that puts her at 34%. two points behind donald trump. >> thank you, nancy. >> tonight, much of historic ellicot city is in ruins, a storm dumped 6 inch of rain in less than two hours. people formed human chains to rescue drivers trapped. errol barnett is there. >> reporter: the devastation was ever where. 200 buildings damaged. gaping holes in storefronts. foundations wiped away. cars stacked on top of each other. the saturday night downpour swelled the nearby river 14 feet in 90 minutes. the floodwaters rushed down ellicot city's main street, pushing 170 cars downstream. a 35-year-old pennsylvania woman and a 3-year-old man from maryland died after they got battling the powerful current, people locked arms to save jamie night from her car. she reunited with the man who pulled her to safety monday afternoon. >> thank you. >> not a problem. >> reporter: national weather service called this a once in a thousand year st. residents and business owners kept out of their buildings on main street. county executive allen kitleman says it is just too dangerous. >> it is a disaster area down there. looks like a war zone. >> i knew i was in trouble. i knew this town was in serious trouble. >> sally tenant had to be rescued by firefighters. >> financially, if i've don't get help, serious help, i don't know if i will be able to recover. that is my life. assessing the damage. and will need to figure out which buildings have to be completely destroyed. and, charlie, santa bash mikulski toured the area and is pledging federal support to residents here. >> thank you, errol. the pilot in the deadly balloon crash in texas had a criminal record. >> later, texas mourns the victims of a college gun massacre even as it expands gun rights on campus. ? ? get ready... to show your roots. with root touch up from nice'n easy it blends with leading shades, even salon shades. in just 10 minutes. so pick your shade. ? susie got all germy ? ? a cold, a bug, a flu ? ? when school was back in session ? ? those germs were shared with you ? back to school means back to germs. and every year kids miss including common cold and flu viruses... to help protect your home and family. and now that lysol is the only disinfectant with box tops, you earn cash for your school, every time you lysol that. court records show the pilot weekend had multiple convictions for drunken driving and served time in prison twice. all 16 people on board were killed when the balloon went down in maxwell, 30 miles south of austin. omar villafranca is on the scene. >> reporter: the hot air balloon ride came to a fiery end eight miles from the launching point. just after 7:40 a.m. saturday, investigators believe the balloon hit high-tension power lines 140 feet in the air. witnesses heard popping noises. the balloon was found 3/4 miles away. >> i looked off over there and the next thing i knew you saw a big fire ball go up. >> reporter: the pilot alfred skip nichols among the victims. he ran hot air balloon ride. the 49-year-old had a license to by lot the balloon though court records showed nichols had been arrested driving intoxicated in missouri. nichols was not required to aviation authority. ntsb lead investigator, robert sumwalt. >> we see this disparity in the level of oversight and requirements. we do not feel that the faa response to our oversight recommendation was acceptable. >> reporter: two victims, mother and daughter, laura lee and paige brabson took this picture on board the balloon. she had an 11-month-old daughter an february. in 2009, mark d said nichols piloted their hot balloon ride. 20 minutes into the ride, the balloon crashed into the mark twain national forest. nichols told the family he ran out of fuel. no one was seriously hurt. of court. >> he shouldn't have been flying. and we wanted to make him accountable for it. >> even though there were 16 people in the balloon. investigators say it was not overloaded. charlie, that type of balloon can carry more than 20 people each weighing 200 pound. >> thank you, omar. >> when we come back along with notebooks and laptops, college students in texas may now carry >> a texas law that expands gun rights on college campuses took effect today. just as victims of the our report tonight from austin. >> reporter: a solemn ceremony at the university of texas-austin today marked 50 years since charles whitman opened fire from the campus clocktower killing 16 people. >> victims were cut down on the west and south side of the campus. >> reporter: on the anniversary of one of the first mass shootings, a controversial texas law allowing concealed handguns in public university classrooms went into effect. officials at the university of texas owe pose the law. >> the more guns the more danger. >> reporter: joan newburger is concerned about its impact in the classroom. >> guns are designed to hurt people. has a gun, you know don't know if you are in danger. >> reporter: newberger feels professors and students will shy away from controversial topics. >> we want students to be passionate about what they have to say. without worrying that some one might pull a gun and shoot you. >> reporter: the law does come with restrictions. gun owners must comply with the concealed carry requirements which include being at least 21, passing classroom and training courses. antonia oakafur that will carry at ut-dallas campus says nothing is farther from the truth. >> these people are not monsters. once they get a license means license to kill. she says seven states have similar laws and pints to the flurry of mass shootings as another reason to allow concealed guns. >> the important thing is that me, as an individual, i am able to protect myself. a law-abiding citizen, am able to protect myself against some one trying to harm me. >> reporter: three u.t. austin professors filed a lawsuit seeking to stop the law before classes begin here later this month. charlie, private universities can opt out of the new law, and most have. divided, strangers unite in song. ? hallelujah ? at a time when there is so much division in the world, we end with strangers coming together spontaneously and harmoniously. here is jericka duncan. ? ? ? and it pleased the lord ? ? >> reporter: 1,500 people of all races, faiths and ages, answered the call to sing. the song, leonard cohen's 1984, ? hallelujah ? >> reporter: the spontaneous performances known as choir, choir, choir, were created by david goldman and nobu adelman and used social media to ask any at a specific location. when david bowie died. his song "space oddity" filled this art gallery. ? i think my station knows which way to go ? >> reporter: the group learns a song for a few hours before recording for the world to see. have created. even if it is three minutes in a day full of, you know, bad news. and tragic events to have that moment to say, it's not all bad. >> reporter: so far they have recorded more than 200 songs. ? don't you know that we're talking about a revolution ? ? including tracy chapman's "talking about a revolution." >> don't you know you better run, run, run, run, run, run. >> debbie innis says watching the aftermath of the police shooting of cast i >> for me the perfect song to vocalize what has been happening for me inside. ? talking about a revolution ? >> reporter: they're crying out through song. >> finally the tables are starting to turn. >> combatting pain by bringing a sense of piece. jericka duncan, cbs news, new york. ? finally the tables are starting to turn ? >> that's the "cbs overnight news" for this tuesday. for some of you the news continues. for others, check back with us a little later for the morning news and cbs this morning. from the broadcast center in new york city. >> announcer: this is the "cbs overnight news." hi, welcome to the "cbs overnight news." i'm demarco morgan. donald trump is taking fire for his derogatory comments about a muslim couple whose son a u.s. army captain died while fight in iraq. the commander of the vfw called the criticism unacceptable and more republican senators are distancing themselves from the nominee. the flak comes as a new cbs news poll shows trump trailing hillary clinton by seven points among registered voters. 46% to 39%. that is a four-point bump for clinton since the close of the democratic convention. major garrett has more. >> after the father of an donald trump, trump responded by questioning that father's religion and even his right to speak about sacrifice. now, as we know, trump writes his own rules. this time his quick reactions are deepening republican reservation as but their standard bearer. >> who wrote that? did hillary's script writers write it. >> wounded donald trump turned on khizr khan lashing out for killed in iraq protecting other troops. >> you have sacrificed nothing. and no one. >> when pressed on history of sacrifice, trump said this. >> i have created thousand and thousand of jobs. tens of thousand of jobs. built great structures. i have done, had, had, tremendous success. i think. >> those are sacrifices? >> sure, i think they are. >> trump implied that khan, a muslim may have silence his wife for religious reasons. >> see had nothing to say. anything to say. >> mrs. khan defended herself in an op-ed. without saying a thing all the world felt my pain. in an interview, mr. khan questioned trump's character. >> i want his family to counsel him, teach him some empathy. he will be a better person if he could become. but he is a black soul. >> reporter: khan urged house speaker ryan and mitch mcconnell to denounce trump. beth released statements. praising the khan family, repeating their object tugs trump's previous proposed ban on trump continues to face question as but his relationship with russian president vladamir put spin. something he once boasted about. >> i spoke indirectly and directly with president putin who could not have been nicer. >> reporter: now trump says he can't remember if he met putin. >> i have no relationship with putin. i don't think i ever met him. i don't think i ever met him. >> you would know it if you did. >> i think so. was an american hero and said disagreement with the khan family about islamic radical terror and inability of leaders to stop it. last night. mike pence said in a statement that trump policies will keep other american families from facing the enduring heartbreak of the khan family. >> hillary clinton joined the chorus of criticism against donald trump. clinton and her runningmate, tim nine city post-convention bus tour across ohio and pennsylvania. they are two of the 11 swing states expected to decide the election. latest battleground tracker, shows clinton with a two-point lead in the states. 43% to 41%. nancy cordes has more. too. she argued trump demeaned so many people at this point that they is hard to know where the bottom is. donald trump is not a normal presidential candidate. somebody who attacks everybody has something missing. campaigning in pennsylvania, and ohio, clinton said trump is so unfit for office, republicans should walk away. >> i think this is a team to pick country over party. >> their first joint bus tour took clinton and runningmate, senator tim kaine through traditionally republican territory. >> i like investors, that's great. but we have got to love workers as much or more. >> they repeatedly called trump out for out sourcing. >> why does he make trump suits in mexico instead of brooklyn, ohio. shame on you, donald trump. shame on you. >> does anybody here believe one word of what he says? not one word. >> but "the washington post" had trouble believing clinton sunday. giving her four pinocchios for this answer on e-mails. >> of after a long investigation, fbi director, james comey said none of the things you told the american public were true. >> chris, that's not what i heard director comey say. director comey said my answers were truthful and what high have said is consistent with what i have told the american people. >> the post called that highly misleading because the fbi director only said that clinton's comments to his investigators were truthful whil >> now to the balloon crash in texas that left 16 people dead. turns out the balloon pilot was convicted of drunken driving four times in missouri and did two stints in prison. and the faa says the company operating the balloon tour had another accident two years ago. a hard landing that injured two passengers. >> the high balloon hit high tension power lines located beyond the railroad tracks. power lines are 8 to 10 stories tall. there was fog in the area saturday morning. investigators are now looking at pictures and videos posted to social media from inside and outside of the balloon to try to figure out what went wrong. jason peno shared this video of his sister laura lee and daughter paige on board the hot air balloon saturday. >> we are so high. >> he fears they are among the 15 passengers killed in the crash. >> all the way until 7:35, posting video, pictures. then it just stopped. >> following what was scheduled to be a 6:49 departure time, this video shows the balloon taking off from the air park after a delay of as much as 20 minutes. at about 7:15 a.m., witness tam tamra calhoon, took hiss photo , writing you can tell there were a lot of people on it. 27 minutes later, the local immediately followed by a call to 911. >> there is physical evidence to indicate that the balloon, or some component of the balloon hit the wires themselves. and not the tower. >> the basket was discovered about 8 miles north of the air park. and the balloon, about 3/4 of a mile beyond that. >> when i got to right about where the red vehicle is over there, that's when -- the thing just -- just went up. >> 49-year-old skip nichols was the balloon's pilot. he flew as a passenger with nichols two months ago. >> he was constantly looking around. he was definitely checking for power lines. >> reporter: two years ago the administration to take a closer look at commercial hot air balloon operators and impose more safety measures. the faa rejected the recommendations, saying they would not result in a significantly higher level of operational safety. the ntsb classified response as the ntsb classified response as an unacceptable resp. for a tough clean with zero 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tops, if you haven't taken your summer vacation yet, it's not too late. when you start shopping for airline tickets, you may be in for a pleasant surprise. airfares are the lowest they have been in half a dozen years. kris van cleave has the story. >> planes packed with summer travelers should be a sign of success for airlines. but new data s domestic airfare for the first part of 2016 dropped nearly 8% over last year. falling to the lowest point since 2010. airlines, especially, ultralow fare carriers, spirit, frontier and have grown aggressively expanding as terror attacks in europe, economic uncertainty, strong dollar and competition are cutting into routes for american, delta and southwest, despite low fuel prices. i think you will see airlines have lower profits than they would have expected for the back half of the year. josh marks is an airline consultant. >> carriers are seeing competition on routes, particularly in markets where they had a market share before. we have seen growth by ultralow cost carriers, offering fares. >> vacation fares have dropped 17% since last july. l.a. to paris, round trip went for 1,500. now can be had for less than 400. new york to hong kong was $900 a year ago. now under $500. chicago to san diego, rarely dipped below $200. until ultralow fare carriers added service. dropping fares as low as $80 round trip. >> i think for a domestic international travel on some routes. the best airfares we have ever seen. >> the airline business is notoriously boom and bust. last year, it was record profits. this year, the airlines are now saying they expect to see revenue decline. but they still expect to end the year in the black. kris van cleave, cbs news, washington. >> for millions of americans, it wouldn't be summer without a trip to the great outdoors. after years of decline, camping is making a big comeback. each year more than 1 million household go camping for the first time. nearly half the campers are millenials, between 18 and 35. that age group has its own idea about what camping is about. mireya villarreal has the the story. >> reporter: for these ten friends looking for the perfect camping spot. nothing beats catalina island which sits about 20 miles off the california coast. millenials are looking for unique destinations, will go the experience that not everyone else is having. travel blogger, camps around the world regularly. posting pictures for more than 8,000 instagram followers. like millenials, part of what drew him were amenities. the campground provide tents, stoves and stand up paddle board and kayaks and provides wi-fi. although camping has always been about connecting with nature. for younger campers, it is also about staying connected. three out of four millenial campers use social media every day traveling and seek out activities worth sharing. campground of america, the world's largest system of privately held campground is taking note. they survey thousand of campers for their annual camping report and are redesigning some of their 500 north american camp younger campers value. toby o'rourke is chief franchise operations officer. what the research tells us, there are several things millenial, quality, recreation, jumping pillows, swimming pools, adventure golf, some campground have zip lines. and definitely wi-fi. >> with younger customers spending money to camp, the 646 billion dollar recreation induhe s approach to the outdoors in a comfortable approach to the outdoors. brand like north face that used to focus on technical gear for avid adventurers are creating stylish, user friendly comfortable products that appeal to millenials. add that once features peak performance are likely to include friend casually gathered around a campfire. >> kind of going from being an outdoorsy to being outsidy. >> not everybody here knows how to build a fire from scratch. >> no. put up a tent. but they're all smart people. sure they can figure it out. >> for younger campers who aren't ready to invest in outdoor equipment. sites like getoutf fitted.com, offer gear rental. hip camp, on liar air bnb type rental make it easier for users to find the reserve unique spots. >> wherever you feel comfortable in the wilderness. as long as you get otside and enjoy nature. go for it. enjoy nature. i say go for it. >> reporter: making this the next generation to discover what makes the great outdoors, so pointing at my wife to pointing at me. and he said, i need your money. >> reporter: but the gunman did not know that russell, a former cnn anchor, and decaro, former cnn reporter who trained as a special forces soldier, travel with guns that they are licensed and trained to use. >> you were able to actually move your gun from the night >> right, i slipped one of the guns into the purse. and handed it to chuck, i said take a really good look inside here. because, see if there is anything you can find that, that we want to give the man. and chuck, looked and he said, yes, there is. >> and they say, as the suspect started to shoot, so i drew. >> decaro fired back. >> and you killed this man. >> and i killed him. >> reporter: but you got shot yourself? it's called combat. >> reporter: you might call them good guys with guns. an idea touted by donald trump. orlando. >> and one of the people in that room happened to have it and goes boom, boom, you know what, that would have been a beautiful, beautiful sight. >> wayne lapierre. >> reporter: and it's become a rallying cry for wayne lapierre. >> the nra will go the distance. >> reporter: ceo of the national rifle association. the nation's most prominent gun rights group. >> the only thing that stops a bad guy with a gun is a good guy with a gun. >> reporter: we asked to speak >> reporter: instead the nra provided former president and current board member, sandy foman of tucson. >> could a good guy with a gun stop a terrorist attack. >> a good guy with a gun could protect himself or herself. i think if you have a choice of using your gun to save your life or having your life taken. yes, i think you should have that choice. >> reporter: basically thought is the more law-abiding people own and are trained to use guns the safer we'll all be. >> exactly. exactly. >> reporter: this is also a personal issue for foman who purchased her first gun at 32 after an attempted break in at her home. >> i think we all need to be prepared in case something really evil happens to us. >> and gun sales are up. with background checks on buyers than 23 million last year. >> start scenario. even some school personnel like these in ohio, are preparior the worst. while many gun rights advocates say it is time to end most bans on guns in public places. known as gun free zones. >> somebody intent on rain, robbery, murder is not going to obey the circle with the line through it. these people are sitting ducks? >> sitting ducks, exactly right. >> reporter: dallas police chief david brown speaking after five officers were shot and killed, says, these good guys actually complicate matters for police. these things. well well don't know who the good guy is versus the bad guy if everybody starts shooting. >> we heard this loud, bang, bang, bang, successions of noises. >> reporter: collin goddard in the thick of a gunman's attack. he was in french class at virginia tech on that day in 2007. >> you could hear it, them then all of a sudden i could see -- bullets coming in the front of the classroom. >> reporter: goddard was lucky. though shot four times he recovered. 32 people were killed. yet, he rejects the idea that good guys with guns could have saved the day. >> there was never really a thought that came in my mind during the course of the event. i was much more concerned with how can we do a better job of stopping the one gun from coming into the classroom than trying to put a gun in every single classroom of my school. you know? a much more dangerous situation. >> goddard works advocating for stronger gun control lautz that he says would keep guns away from the bad guys in the first place. but the nra insists we don't need more laws. every time you pass a new law instead of enforcing the existing laws, you further burden law-abiding citizens. >> chuck, obviously the cane, none of that was there before, huh? >> as for chuck decaro, he is now undergone six surgeries. he and his wife lynn russell believe that their right to bear arms saved their lives. but they say, being a good guy with of a gun is not a political decision, but a personal one. >> i don't tell anybody go out and get a gun. i've don't, right. to use that gun to defend yourself, that life is never going to be the same again. >> the "cbs overnight news" will be right back. men and women than 2 million have served in our military since 9/11. i was privileged to serve with hundreds of thousands of them and now many are returning to civilian live. they are evaluating career options. beginning new jobs. and starting businesses. acp advisor net can help them. acp advisor net americans cantne cmunity where provide advice to those who have served. now we can serve those who served us (franklin d. roosevelt) the inherent right to work is one of the elemental privileges of a free people. endowed, as our nation is, with abundant physical resources... ...and inspired as it should be to make those resources and opportunities available for the enjoyment of all... ...we approach reemployment with real hope of finding a better answer than we have now. >> the countdown has begun to summer olympics in rio the torch will be lit on friday. is the city ready. over the weekend, waves hammered the building designed to house along the beach. and that mess is nothing compared to what a lot of athletes are already facing before the games even get under way. ben tracy is there. >> reporter: with less than a week to go before friday's opening to go before friday's opening ceremony, athletes from around the world are pouring into rio, ready to compete. >> you know brazil is an amazing country for volleyball. really excited to be here and experience it. >> reporter: while workers race to put finishing touches on venues and accommodations. rio's ability to pull off this olympic sized event is still being questioned. on friday, members of the australian team were robbed, after a small fire forced an evacuation of the olympic village. initially refused to move in. citing blocked toilets, leaky pipes and exposed wiring in their rooms. >> in an area that size with the number of buildings and rooms there are, unfortunately, theft is going to be inevitable. >> saturday, a set back. the main boat ramp of the sailing venue collapsed during a wind storm. but security is still rio's biggest concern. in july at least 12 people suspected of planning terrorist attacks were arrested. officials maintain threat to the game has been made. >> we have full confidence there in the brazilian authorities with regard that, to, to security. and the ioc is taking into consideration olympic-related security measures. >> reporter: it's been seven years since rio was awarded south america's games. rio got the games before zika u committee says all the problems will be forgotten oncethe games begin. >> we are more confident than ever that we will have great olympic games a la brazil with the great spirit here in rio de janiero. for cbs this morning, ben tracy ???