Nightly news begins right now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. Urgent help is on the way for travelers at one of the nations busiest airports tonight after hundreds missed their flights on sunday, because of understaffed tsa checkpoints and very long lines. Today the head of the tsa apologized to passengers affected by the boltneck at chicagos ohare airport, and dispatched a crisis team to get things moving. Increasingly long waits at security checkpoints across the country have caused tens of thousands to miss flights this year, and the fact that were already seeing meltdowns on a scale of what happened sunday in chicago, ahead the busy travel season is deepening concerns. The developments in this unfolding crisis. Reporter long lines again this morning at chicagos ohare. Passengers missing flights. This, after many were forced to sleep on cots sunday. The entire airport, for the entire domestic flights. Its like crazy. Reporter today the head of the tsa rushed a team to chicago to get to the bottom of it. We had a significant challenge in chicago yesterday. I dont know what that was. Were fixing that. Thats a great concern to me. I always tell people i wont apologize for doing our job well, but i do apologize to the people who found themselves stranded in chicago yesterday. Reporter chicago has consistently seen the worst lines in the country with passengers today told to arrive three hours before their flight. We just wanted to get here early. Its ridiculous and unnecessary. Reporter but nationwide, in cities like portland, los angeles, and atlanta, people continue to tweet photos of long lines with the ihatethewait. Tsa said the number of passengers flying is up significantly. As the Summer Travel season approaches, tsa is promising more overtime to keep checkpoints open, more bombsniffing dogs, and the hiring of additional workers, according to this job posting, as soon as possible. Illinois senator dick durbin today called on airlines to do more also. Im calling on the Major Airlines to waive their checked baggage fees during the peak Summer Travel months. They can help solve this problem. Reporter a problem seeking solutions that cant come soon enough. After that tsa team was returned here to chicago today, we did notice more workers and shorter lines. Right now, every checkpoint is open. American airlines tells me theyve hired 50 additional workers of their own to assist the tsa in getting passengers through these checkpoints more quickly. Hope tonight that the change will last. Blake, thank you. Disturbing new details on the news we first told you about here last night, a little more than a year since that deadly amtrak disaster outside of philadelphia, the ntsb issued a final judgment on the cause. Much like distractions on the road, investigators say the trains engineer was also distracted by radio traffic, and the automatic braking technology that could have prevented the accident is still not in place on 80 of the nations passenger tracks. Heres nbcs tom costello. Reporter it was the biggest mass casualty emergency involving amtrak in decades. We have people on the tracks, and a couple of cars overturned. Reporter eight dead, 200 injured. Today the ntsb concluded engineer Brandon Bostion had been distracted by radio traffic. He went in a matter of seconds from distraction to disaster. Reporter that radio traffic came from a nearby regional train that reported being hit by a rock. Just as amtrak 188 was pulling out of north philly. For six minutes, say investigators, bostion was so focused on the radio traffic, he lost track of his own speed and location, going into the curve at 106 miles per hour, double the posted speed limit. What a new automated braking system had not yet been installed on that stretch of heavily traveled track. 2,200 trains go up and down the corridor every day. 750,000 people rely on it. 40,000 of those are amtrak customers. Today amtrak says ptc is now in place along the entire northeast corridor. This kind of accident would be prevented, would be the backstop for amtrak or any railroad with positive train control. Reporter but its only installed on 21 of passenger tracks. Railroads have at least two and a half years to complete the job. Meanwhile, engineer bostion remains on unpaid leave with prosecutors still considering criminal charges. Tom costello, nbc news, washington. Lets turn to the 2016 race. Hillary clintons lead in the general election slipping in our nbc News Survey Monkey poll to just three points over donald trump since last week. But theres much drama over clintons other opponent tonight. Bernie sanders, after nevadas Democratic Convention erupted in chaos over the weekend. As our Andrea Mitchell explains, his supporters are accused of violent outbursts, and now death threats. Reporter chaos in vegas. Angry Bernie Sanders supporters at the Democratic State convention with delegates are awarded. Please take your seats. Reporter the sanders forces demanding a recount saturday. The chairwoman shutting them down, ending sanders hope of picking up more delegates after he lost to clinton back in february. Is this a great night or what reporter tonight the chairwoman releasing voice threats she said shes been getting from sanders supporters. People like you should be hung from a public execution to show this world that we wont stand for this sort of corruption. Ive got threats to my family, to my grandson, to my husband. Reporter when the state party accused the Sanders Campaign of a, quote, penchant for actual violence, sanders at first not responding. Then firing back in a statement, that is nonsense. I condemn any and all forms of violence. Including the personal harassment of individuals. Its imperative that all state parties treat our Campaign Supporters with fairness and the respect they have earned. Could that be a not so subtle warning about julys National Convention . The convention itself could be a problem to Hillary Clinton. Its what happens afterwards if they dont have real unity that people buy into. Thats the problem for her in the general election. Reporter meanwhile, a Hillary Clinton super pac targeting her bigger challenge, donald trump. In new ads today, aimed at women. I view a person as flat chested is hard to be a 10. Reporter trump retaliating against bill clinton, saying crooked hillary can do a hit ad on me when her husband was the worst abuser of women in the history of u. S. Political history. The former president asked to respond. No. I wont. I think people are smart enough to figure this out. Reporter but Hillary Clinton still has to worry about tonight. Hoping to stop Bernie Sanders recent winning streak by at least defeating him in kentucky, to avoid stumbling across the finish line as she has toward a likely nomination. Andrea, mitchell, thank you. A potentially violent night of weather for millions. A funnel cloud was spotted in vero beach, florida, this evening, as storms dropped more than 9 inches of rain triggering flash flooding. Powerful storms will hammer texas into the night, with more flooding, hail and tornadoes possible. Now to a new olympic bombshell. Word of yet another alleged doping scandal. This time, the suspected cheats come from 12 different countries. The International Olympic committee accusing the athletes. The positive test results come from retesting samples from the beijing games. The question tonight, could some of the athletes preparing for rio be banned from those games. Our national correspondent, miguel almaguer, has details. Reporter tonight in a major doping crackdown stretching back to the games in beijing, 31 athletes are now accused of cheating their way across the olympic finish line. Today the president of the International Olympic committee called the action a powerful strike against the cheats. Retesting 454 samples from beijing with the latest technology, exposing dopers from 12 countries in 6 sports. The unidentified athletes planning to compete in rio now face a possible ban. This is for sure the tip of the iceberg. Whats at issue in the doping context is an eternal catandmouse game. And frankly, its human nature to cheat. Reporter with samples stored for ten years, the ioc says its now focusing on Medal Winners in beijing, while they continue to retest samples from the london games. The probe comes after accusations of widespread doping by russia in sochi. Today the department of justice ordered its own investigation. Some athletes have denied wrongdoing. The Russian Track Team already facing a possible ban in rio. Allison felix, an american gold medalist, just wants a fair race. I think thats the reality of the situation right now, that for sure theres going to be athletes who are doping in rio. Reporter with the rio olympics now just 80 days away, tonight the race to clean up the games is full speed ahead. Miguel almaguer, nbc news, los angeles. Theres big news tonight for everyone concerned about whats in our food, especially genetically modified foods. Known as gmos, a lot of what americans eat, though you may not even know it. A brandnew study seeks to put minds at ease over gmos, declaring them safe to have on our plates and in our environment. Nbcs rehema ellis has more. Reporter food with genetically modified ingredients is in almost every aisle of the grocery store, from cereal to soups to breads. But since the day gmos hit the market, theres been controversy about whether theyre safe, concerns that they might be linked to cancer, obesity and allergies. A new comprehensive report out today from the National Academy of Sciences Says they are safe. Finding gmos pose no health risks, and dont harm the environment. There were really no evidence that there is any more health risk to genetically engineered foods than there are from foods from the conventional counterpart. Reporter more than 90 of corn, soybeans and sugar beets grown in the u. S. Are genetically modified to make them heartier, more resistant to drought, disease and insects. Todays report calls for more transparency, in the way foods with gmos is marked, with some calling for labels on all products with gmos. This is really about the consumers right to know, to decide for themselves what they want to feed their families. Reporter while as many as 30 states have introduced initiatives to require labeling, its only passed in three. Some food giants, including general mills, campbells, and mars, have responded to consumer demand, and started labeling their products with gmos. Today a step toward settling a debate thats been growing for decades. Rehema ellis, nbc news, new york. A california grand jury has indicted an Oil Pipeline Company and one of its employees in connection with a pipeline break that spilled more than 100,000 gallons of crude oil along the Santa Barbara coast last year, closing beaches, and killing over 100 animals. They said the indictment contains 46 charges of state law violations. The company says it was an accident and there was no criminal behavior. A series of isis bombings has made this one of the most violent days of the year so far in iraqs capital. At least 76 people were killed in three separate bombings across baghdad. It comes as american troops get closer than ever to the front lines against isis in iraq. We get more from nbcs bill neely. Reporter bloodshed in baghdad. A wave of isis bombers striking Outdoor Markets and a restaurant, soft targets, concrete blast walls didnt protect the shoppers from the female suicide bomber in their midst. Isis targeting shia muslim areas, trying perhaps to reignite sectarian war here. Killing almost 200 in baghdad in a week, bombing the main gas plant in the capital. The string of attacks by isil is the latest reminder of the danger this group poses to all iraqis. Reporter u. S. Air strikes have hit isis hard. 250 more troops are promised to help fight the group. But the death of u. S. Navy s. E. A. L. Charles keating in a battle with isis shows its aiming to take american lives. U. S. Officials say additional troops arent needed yet. But in baghdad, theyre protesting, storming the protected green zone and Parliament Last month, tearing down walls. Furious and fearful of isis and of more blood on the streets. Bill neely, nbc news, london. Theres a lot more ahead for us here tonight. Dont get burned this summer by your sunscreen. A surprising number may not protect as advertised. Well tell you which ones have come under question. How to protect yourself and your family. Also, caught on camera, what is that . Also, caught on camera, what is that . Lighting up the nigh with usaa is awesome. Homeowners insurance Life Insurance automobile insurance i spent 20 years active duty they still refer to me as Gunnery Sergeant when i call being a usaa member because of my service in the military to pass that on to my kids something that makes me happy my name is roger zapata and im a usaa member for life. Usaa. We know what it means to serve. Get an insurance quote and see why 92 of our members plan to stay for life. If youve gone to extremes to escapetry clarispray. Ergies. New, from the makers of claritin. With the 1 prescribed ingredient. And nothing is more effective at relieving your sneezing, runny nose and nasal congestion. Return to the world with clarispray. Introduces new, easytoswallow tablets. So now, there are more ways, for more people. To experience. Complete protection from frequent heartburn. Nexium 24hr. The easytoswallow tablet is here. 80 of recurrent ischemic strokes could be prevented. And im doing all i can to help prevent another one. A bayer aspirin regimen is one of those steps in helping prevent another stroke. Be sure to talk to your doctor before you begin an aspirin regimen. Unless you have allergies. Flonase is the first and only nasal spray approved to relieve both itchy, watery eyes and congestion. No other nasal allergy spray can say that. Go ahead, embrace those beautiful moments. Flonase changes everything. They never be good. Purina believes it can. Inspecting every ingredient for quality . Thats big. Being confident that your pets food is 100 safe . Thats big, too. Spending more healthy years with your best friend . Thats amazing. Big is exciting. Daring. For everyone. Pets dont just make life better they make it bigger. Purina. Live big. The American Academy of dermatology says that sunscreen with an spf of 30 blocks 90 of the suns rays protecting you from cancer, if you apply it correctly, and often enough. But tonight Consumer Reports says they found that many of the sunscreens on the market arent doing the job as well as they claim. So how do you know which labels you can trust as we head into summer . Heres nbcs morgan radford. Reporter in california today, Rebecca Bryant and her two kids are relying on sunscreen to have a little fun in the sun. Theyll fry out here. Reporter in a new Study Released today, Consumer Reports tested 65 waterresistant sunscreens claiming an spf of at least 30. And found that 43 of them didnt measure up. For example, the report says banana boat kids and cvs kids showed an sp of 8. They dont regularly test sunscreens itself. Also, they dont require that the manufacturers send their test results to the fda. Reporter participants soaked in water for the time the sunscreen claimed to be water resistant, and their skin was exposed to uv light and examined the next day. Dr. Jessica krantz is a dermatologist on the Consumer Reports medical Advisory Board but not involved in this study. Youll apply a golf ball sized or shot glass size every two hours. Reporter doctors say sunscreen with at least spf 30 is most effective at blocking the suns rays. Its important to remember sunscreen is not magic. Avoid midday sun, wear a hat, sunglasses. Reporter standing behind their spf labels, in a 125i789 to nbc news, the makers of banana boat said all its products are appropriately labeled for spf. Cvs said it did sentence of rye testing of its sunscreen and met all product specifications. Today Consumer Reports published its list of sunscreen. I hope they can figure it out and sell the correct products so i can make sure im buying the right products for my kids. Were back in a moment with history being made in the military. dog mmmm. Weve been together since 2012. Dinner is absolutely our favorite time together. I do notice that sometimes i eat better than her. I get my healthy bowl of beneful, and she eats a cheese stick and a cracker. Thats what she ate last night. Cheese stick and a cracker. Can you believe what some people put in their bodies . vo beneful originals is a healthy blend. Your dog will love. With whole grains, real beef and accents of vegetables. Beneful. Healthy with a side of happy. Iveand im doing just fine. Allergies. Claritin provides 24hour relief of symptoms that can be triggered by over 200 allergens. Yeah, over 200 allergens with claritin my allergies dont come between me and victory. Live claritin clear. [ guitar playing ] ugh. Heartburn. Sorry maam. No burning here. Try new alkaseltzer heartburn relief gummies. They work fast and dont taste chalky. Mmmm. Incredible. Looks tasty. You dont have heartburn. New alkaseltzer heartburn relief gummies. Enjoy the relief. Once i left the hospital after a dvt blood clot. What about my wife. What were building together. And could this happen again . I was given warfarin in the hospital, but wondered, was this the best treatment for me . I spoke to my doctor and she told me about eliquis. Eliquis treats dvt and pe blood clots and reduces the risk of them happening again. Not only does eliquis treat dvt and pe blood clots. But eliquis also had significantly less major bleeding than the standard treatment. Knowing eliquis had both. Turned around my thinking. Dont stop eliquis unless you doctor tells you to. Eliquis can cause serious, and in rare cases, fatal bleeding. Dont take eliquis if you have an artificial heart valve or abnormal bleeding. If you had a spinal injection while on eliquis call your doctor right away if you have tingling, numbness, or muscle weakness. While taking eliquis, you may bruise more easily. And it may take longer than usual for bleeding to stop. Seek immediate medical care for sudden signs of bleeding, like unusual bruising. Eliquis may increase your bleeding risk if you take certain medicines. Tell your doctor about all planned medical or dental procedures. Eliquis treats dvt pe blood clots. Plus had less major bleeding. Both made switching to eliquis right for me. Ask your doctor if its right for you. A lot of stunned people across the northeast late last night wondering what in the world that was streaking across the sky. Hundreds of sightings of a fireball from new jersey all the way to canada. The Portland Police department joked, and im quoting here, the meteor or alien spaceship was caught on camera at approximately 0050 hours. Lets hope the visitors are friendly, they said. For the record, it was a meteor. Disturbing story tonight from italy involving a paramedic who rushed soprano star gandolfini to the hospital. At a hearing today, prosecutors accused the paramedic of stealing his rolex watch either from his hotel room or right off his wrist. As he lay dying three years ago. The judge delayed the start of the trial until november. History has been made with the confirmation of the first openly gay leader of a u. S. Military service. The senate today confirmed eric fanning as army secretary. He was nominated eight months ago but was held up in dispute over closing the u. S. Prison at guantanamo bay. What happens to tributes left behind for Fallen Heroes . We to you, theyre more than just a pet. So protect them with k9 advantix ii. It kills fleas, ticks and mosquitoes. K9 advantix ii. For the love of dog. Fight heartburn fast. With tums chewy delights. The mouthwatering soft chew that goes to work in seconds to conquer heartburn fast. Tum tum tum tum. Chewy delights. Only from tums. Masame time tomorrow, fellas . New dr. Scholls stimulating step insoles. They massage key pressure points with each step, for all day comfort that keeps you feeling more energized. Dudes got skills. New dr. Scholls stimulating step insoles. Its easy to love your laxative when that lax loves your body back. Only miralax hydrates, eases and softens to unblock naturally, so you have peace of mind from start to finish. Love your laxative. Miralax. Perfect driving record. Perfect. No tickets. No accidents. That is until one of you clips a food truck, ruining your perfect record. Yeah. Now you would think your Insurance Company would cut you some slack, right . No. Your insurance rates go through the roof. Your perfect record doesnt get you anything. Anything. Perfect. For drivers with accident forgiveness, Liberty Mutual wont raise your rates due to your first accident. See Car Insurance in a whole new light. Liberty mutual insurance. Finally tonight, a rare look inside a place where memories of fallen american heroes live on. While they are left behind, they are not lost. They end up in a vault for safekeeping and our Kevin Tibbles takes us inside. Reporter the things we carry to the Vietnam Veterans memorial, respect, honor, heavy hearts. But many who visit this solemn black wall with its 58,000 names often leave something behind. A memento. Reminding us these names belong to someone. Its not just a paper. Reporter delivered to a National Park warehouse. Janet is charged with curating these powerful pieces of who we are. The baby sweater of a boy who grew up to perish in vietnam. By his mother. Shes saying she couldnt bear to part with his teddy bear. Reporter a beloved lassie. Built and painted by a 12yearold boy. Reporter a token of love. The letter says even though shes moved on, he will always be her first love. Reporter some leave their medals. One left the bullet that killed his friend. A toast with champagne, or a simple can of beer for a buddy. I always hope that what im doing would be acceptable to the people who leave things at the wall. Reporter row upon row, hundreds of thousands of keepsakes, all treated with respect. At the memorial, peter watches them come. Some days its very emotional. You realize how important it is. Reporter because it is part of the healing. Children and grandchildren. Reporter a collection of who they were to hold on to forever. Kevin tibbles, nbc news, washington. Ha and t kim kardashian, officially crowned the first ever queen of the web. Nude selfies until i die. How ellen helped shape her speech, and the private snapchat on the way to canes. Then, before tonights trump tv event months in the making its great to meet you. Such a pleasure to meet you. Megyn kellys sitting down with mario. Why do you think you hit such a nerve with him . What youll see for the first time ever, and the milliondollar question about megyns future. You staying at fox . Celine dion on her final moments with husband rene. I kissed him so much. How her kids are coping without their father. Then, before michael weatherlys ncis farewell, he has one thing left to say. I made friends, i fell in love. Okay, maybe a few things. I fell out of love. I made enemies. New couple alert. Whos the mystery man with padma lakshmi