a head above the rest. and a letter, predicting what would happen in rio, long before it did. good evening. and we begin tonight with the new controversy in the race for president. donald trump late today talking about hillary clinton and the selection of supreme court justices. saying, if she's elected, there's nothing you can do. then, adding, quote, the second amendment people, maybe there is. tonight, the ou some saying this is not a political misstep, that this is a dangerous threat. we begin with abc's tom llamas, on the campaign trail. >> reporter: tonight, donald trump accused of crossing the line in a dangerous and violent way. >> hillary wants to abolish, essentially, abolish the second amendment. by the way, and if she gets to pick -- if she gets to pick her judges, nothing you can do, folks. people, maybe there is, i don't know, but -- >> reporter: just look at how one trump supporter reacted after trump said that. hillary clinton tweeting this statement from her campaign, "a person seeking to be the president of the united states should not suggest violence in any way." the trump campaign says he wasn't talking about violence, that he was trying to rally support, releasing this statement -- "it's called the power of unification. second amendment people have amazing spirit and are tremendously unified, which gives them great political powe and about his comments that clinton will pick the next supreme court justice, the nra coming to trump's defense, tweeting -- "donald trump is right. if hillary clinton gets to pick her anti-second amendment supreme court judges, there's nothing we can do." but clinton supporters not buying it. from the democratic connecticut senator chris murphy, where the newtown shooting still resonates, tweeting, "this isn't play. of a national tragedy and crisis." and it's not just democrats. now many prominent republicans in the last 24 hours say they've had enough of trump. 50 leading gop national security experts writing that letter saying trump would be, quote, the most reckless president in american history. today, another prominent republican, senator susan colins of maine, also saying she won't vote for trump. >> i do not believe that he is the president that we need at this time in our co >> reporter: trump earlier today, saying there's nothing wrong with his campaign style. >> i've always had a good temperament and it's gotten me here. i certainly don't think it's appropriate to start changing all of a sudden when you've been winning. >> reporter: and dismissing the growing number of gop leaders abandoning him. >> you know, these poll situations, they don't know me. they don't understand me. >> and tom llamas with us live tonight from north carolina. and tom, back to those words, donald trump addressing, quote, second amendment people today, critics saying this was dangerous, and a threat. >> reporter: david, tonight we reached out to the secret service, they told us, they are aware of what donald trump said, but right now, there is no comment if this will be investigated. david? >> tom llamas, thank you. and this all comes amid the polls showing hillary clinton expanding her lead nationally, and tonight, there are new polls in the key battleground states. take a look. in the must-win state of ohio, clinton leading 43% to trump's 38 now at 48%, to trump's 37%. but hillary clinton's campaign is also facing its own questions tonight, about an unexpected visitor seen right behind her during a campaign event in florida. there in the red cap, the father of the shooter at that nightclub in orlando. abc's cecilia vega on why he was right there behind hillary clinton. >> reporter: a florida campaign father of orlando shooter omar mateen. >> bill and i were in orlando about two weeks ago, and we had a chance to sit down with mayor dyer. >> reporter: mateen taking photos as clinton remembered the attack that left 49 people dead. a site clinton recently visited, laying flowers to honor the victims. mateen telling orlando >> it's the democratic party, so everybody can join. >> reporter: so, how did he get this prime spot? secret service telling us mateen passed through metal detectors like everyone else. clinton's aides will only say, "this individual wasn't invited as a guest and the campaign was unaware of his attendance until after the event." also tonight, clinton under fire, once again, over benghazi. parents of two americans killed in the attacks, including this mother, who spoke out at the republican convention -- personally for the death of my son. >> reporter: -- now timing a wrongful death lawsuit against clinton, tying it to her private e-mail server, saying her, quote, extreme carelessness, caused the attack. the clinton campaign responding, saying nine different investigations into benghazi, and, quote, none found any evidence whatsoever of any wrongdoing on the part of hillary clinton. >> and so let's get right to abc's scecilia vega. and cecilia, the clinton hours that mrs. clinton is ready for the three debates and will participate in the fall. any word from the trump team from that? >> reporter: well, david, he now says absolutely there will be three debates, but it comes with a caveat. he wants to see the conditions and to know who the moderators are. david? >> cecilia, thank you. we move on this evening, and to the investigation after the fall from a ferris bheelwheel i tennessee. we have new reporting this evening about what might have accident. three girls tumbled from the basket, you see right there, after it tilted and apparently got stuck. the pink one there. authorities tonight acknowledge there within mechanical issues and many asking, was there no belt, no bar holding them in? here's abc's steve osunsami now. >> reporter: the youngest of the girls, just 6 years old, is in the worst shape tonight. doctors say she suffered a traumatic brain injury when they fell from the ride. >> i've got three kids that fell from the ferris wheel. three kids. >> reporter: investigators say as this orange cart children rose into the sky, it got caught against this other cabin, and was turned nearly upside down, throwing the three girls to the gravel, some 4 feet. two of them had to be airlifted to the hospital. >> i just feel bad for the little kids, you know. they just screamed a little bit and then they just hit the ground and then just land there. >> reporter: parents worried their children might be hurt raced to the ferris wheel, as rescue teams used a fire truck to free riders who were still trapped. >> the ferris wheel was tilted, leaning to one side. leaning to one side. >> reporter: the big question take a look. we didn't see any of either. >> there are no, by design, there are no seat belts. >> reporter: inspectors are now saying that a mechanical issue. we look at rules on safety restraints and found that in some cases, standards are voluntary. david? >> all right, steve, thank you so much. and in kansas city tonight, new developments after the death of a 10-year-old boy on a water slide. and this image this evening, a raft arriving at the bottom of that same without any shoulder harness at all. it apparently fell off on the way down. that image comes amid questions this evening about those harnesses, and the safety of the slide. abc's alex perez on that story. >> reporter: tonight, investigators searching for what caused caleb schwab to be thrown from the high speed water slide, resulting in that fatal neck injury. new details emerging tonight about previous problems at that very same ride. paul oberhauser says the safety his wife took this video. you can see his son in the front and his friend in the middle both have straps, but he does not. he held onto handles near his legs. >> i just gripped it really tight. just held on as i went up the top of the next hill. >> reporter: than photo of an incident in 2016 also shows a man whose shoulder strap fell off. park officials declined to comment today when we asked about reports of faulty safety straps. across the country slide injuries estimated last year alone. kansas officials saying today they are investigating whether the park met safety requirements. the slide will be closed for the remainder of the season, but the rest of the park reopens tomorrow. david? >> all right, alex perez with us, as well. alex, thank you. thousands of american passengers remain stranded tonight, more than 1,600 flights canceled now. after that computer meltdown yesterday morning at delta. 48 hours of cancellations. here's abc's david kerley, getting answers. >> reporter: more long lines, delays and cancellations. a second day of the delta debacle. >> this is a bummer. >> reporter: tonight that's led to more than 1,600 flights canceled over two days, as computers are still slow. >> kiosks wont print boarding passes. this is your only option for a boarding pass. >> reporter: and it is still a worldwide problem, from europe to asia. american jeff quigley is stuck in japan. >> thereer out, because it was getting really ugly. >> reporter: early monday morning, a piece of delta power equipment failed and its computers crashed. even though electricity was quickly restored, the airline says some of its computer systems didn't switch over to the backup power. some did. and its systems are operating with still some instability tonight. from delta's ceo, a second apology. >> this isn't who we are. this isn't the quality of service and the reliability that you've come to expect from delta >> so many passengers are going to be saying that second apology simply is not enough with them still waiting for their flights, now 48 hours later, david. >> reporter: and the ceo says there will be even more delays, more cancellations, tomorrow morning, david. they're hoping by tomorrow afternoon they can get back to a regular schedule, regular operations. >> all right, david kerley, who covers aviation for us. thanks. next here tonight, to the wildfire danger growing in the west at this hour. more than 5,000 families fleeing their homes now. the p east of los angeles, a number of schools closed. and abc's kayna whitworth is on the fire lines tonight. >> reporter: david, the air quality here is so bad, that parents say it looks like it's snowing ash. the fire jumping fire prompting thousands more evacuations monday night. hand crews using fireproof gel to protect the homes that they wind is actually helping them push the fire away from residents, but the battle is on for that ridge that there. if they lose, thousands more are in danger. david? >> kayna, thank you. and in the southwest, a giant dust storm blowing over phoenix this afternoon. fizz vblt down to a quarter of a mile there. then look at the flash flooding hitting tucson. the remnants of those tropical storms. let's get to rob marciano, tracking it all for us. >> reporter: david, after a short break, the southwest monsoon is back in action. ai moisture from tropical storm jav javier. some of the storms near phoenix, 50 miles an hour winds, which kicked up the dust. more of that tomorrow. and seed heavier rain. could see one to three inches of rain. flash flooding and mudslides a possibility through thursday. panhandle of florida, this stubborn low continues to spin. we saw nine inches of rain in one spot in 2 last 12 hours. look for another five at least from perry, pence loca and new orleans. the folks that live in the big easy should prepare for a wet go and the possibility of flooding. and now, to rio tonight. where team usa is going for the gold. and adding to the summer games medal count and history made this evening. of course, swimmer lilly king settling the store with her russian opponent, earning gold herself. but late today, the u.s. women's gymnastics team, keeping its streak alive, holding their gold medals. that image seen across the internet at this hour. and tonight, michael phelps getting his game face on. he will swim for a record number of gold medals later tonight. four days into the games, team usati medal count. abc's matt gutman, part of our team, right there in rio tonight. >> reporter: tonight, the women's gymnastics team living up to months of hype. they didn't just win, they vaulted over the competition. anchored by the human spring, simone biles, they won every single category. and later tonight, the man to watch, michael phelps, the winningest olympian ever, who we're used to seeing grinning with gold or in a celebratory appearing to give his south african rival, who beat him four years ago, the death stare. tonight, they are facing off in a lee match, phelps going for his 20th gold. with his mom, fiance and infant son, boomer, wearing those tiny team usa headphones, cheering him on from the stands. phelps won gold in the men's 4 by 100 meter relay on sunday. so, a guy that doesn't cry almost ever, cries twice in a olympics does to people. >> reporter: we met held today. >> i cried on the podium. michael said, you know, i've been here 19 times before, and, like, i might start tearing up on this one. >> reporter: and a cold war rivalry heating up. lilly king backing up her infamous finger wagging scold, with a medal of gold. touching the wall a blink of an eye before her russian rival. then, refusing to acknowledge doping and getting in one final cold war era dig in afterwards. >> we can still compete clean and do well at the olympic games. >> reporter: and more redemption in the pool for americans, 30-year-old david plumber becoming the oldest man to win a first medal in the olympics since 1912. david bud ya and steele johnson making a small splash in synchronized diving. coming from behind to win silver. torquing and twisting in near perfect difficult, in part because of their significant five inch height difference. johnson is 6'2", budia, 5'9". creating their success to sharing the same coach and learning there dives together. david, gymnastics competitions are often decided by a hundredth of a point. tonight, the women's team won by eight full points. now, in london, the women's team called itself the fierce five. its new name seems to be well david? >> the smiles and those gold medals late today. matt, thank you. and there is still much more ahead on "world news tonight" this tuesday. we have new developments tonight in the death of a second female jogger. that community on edge. the jogger found here her parents' home. and authorities revealing news about their investigation. their news conference, late today. also, take a look at this. the scare on an american highway tonight. this driver seen texting with one of her legs up on the dashboard. a passenger so concerned in another car, recording it all. and then, the security scare at the airport. a passenger apparently missing his flight, jumping from the jet bridge and running toward the plane, across the tarmac. let's just say authorities were gary, gary, gary... making simple, smart cash back choices... with quicksilver from capital one. you're earning unlimited 1.5% cash back on every purchase, everywhere. like on that new laptop. quicksilver keeps things simple, gary. and smart, like you! and i like that. i guess i am pretty smart. don't let that go to your head, gary. what's in your wallet? 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>> linsey davis, thank you. when we come back, the big shakeup at "snl" tonight. who is leaving the show? also, the security breach on the runway. the passenger jumping from the jet bridge, running across the tarmac, trying to get into that little car. and the driver spotted on the highway, and the outrage tonight over what she was doing. we came up with a plan to help reduce my risk of progression. and everywhere i look... i'm reminded to stick to my plan. ing preservision areds 2. my doctor said preservision areds 2 has the exact nutrient formula that the national eye institute recommends to help reduce the risk of progression of moderate to advanced amd... after 15 years of clinical studies. preservision areds 2. because my eyes are everything. when it comes to healthcare, seconds can mean the difference between life and death. for partners in health, around the world. the microsoft cloud helps our entire staff stay connected and work together in real time to help those that need it. the ability to collaborate changes how we work. what we do together changes how we live. constipated? 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>> amy, thank you so much. the power of a boy with a dream. and girls, too, tonight. and girls, too, tonight. good night. fios is not cable. we're wired differently. so we wired the wagner's house with 100 meg internet. 12 seconds. that's the power of fiber optics. and right now you can get 100 meg internet with equal upload and dowloads speeds, tv and phone for just $69.99 per month online. cable can't offer internet speeds this fast at a price this good. this is the "jeopardy!" tournament of champions. now let's meet today's semi-finalists -- a graduate student in mathematics from columbia, maryland... a software developer from malden, massachusetts... and a currency trader from chicago, illinois... and now here is the host of "jeopardy!" -- alex trebek! thank you, johnny. thank you, ladies and gentlemen. at the end of this program, two of the three people we have just introduced