And the 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 shes elected, theres nothing you can do. Then, adding, quote, the Second Amendment people, maybe there is. Tonight, the outrage is immediate. Some saying this is not a political misstep, that this is a dangerous threat. We begin with abcs tom llamas, on the campaign trail. Reporter tonight, donald trump accused of crossing the line in a dangerous 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. Although, the Second Amendment 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 trump wasnt talking about violence, that he was trying to rally support, releasing this statement its called the power of unification. Second amendment people have amazing spirit and are tremendously unified, which gives them great political power. And about his comments that clinton will pick the next Supreme Court justice, the nra coming to trumps defense, tweeting donald trump is right. If Hillary Clinton gets to pick her antiSecond AmendmentSupreme Court judges, theres nothing we can do. But clinton supporters not buying it. Senator chris murphy, from connecticut, where the newtown shooting still resonates, dont treat this as a political misstep. Its an assassination threat, seriously upping the possibility crisis. And its not just democrats. Many prominent republicans in just the last 24 hours say theyve 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 Collins of maine, also saying she wont vote for trump. I do not believe that he is the president that we need at this time in our countrys history. Reporter trump earlier today saying nothings wrong with his campaign style. Ive always had a good temperament and its gotten me here. You cant, and you dont want to, i certainly dont think its appropriate to start changing all of a sudden, when youve been winning. Reporter and dismissing the growing number of gop leaders abandoning him. You know, these politicians, they dont know me. They dont 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, hes standing by his words, but 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 whether this will even be investigated. David . Tom llamas tonight, leading us off. Tom, thanks, as always. 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 mustwin state of ohio, clinton leading 43 to trumps 38 . In pennsylvania tonight, she is now at 48 , to trumps 37 . But Hillary Clintons 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. Abcs cecilia vega on why he was right there behind Hillary Clinton. Reporter a Florida Campaign rally about 3,000 people strong 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 West Palm Beach station wptv he was invited. Its 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. Clintons aides will only say, this individual wasnt 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 filing a wrongful death lawsuit against clinton, tying it to her private email 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 lets get right to abcs cecilia vega. Also with us live tonight. And cecilia, the Clinton Campaign saying in the last 24 hours, that mrs. Clinton is ready for the three debates and will participate in the fall. Any word from the trump team from that . Will he meet her on that stage . Reporter well, david, he now says absolutely there will be three debates, but it seems to come with a caveat. He wants to see the conditions and to know who the moderators are. David . Cecilia vega with us tonight. Cecilia, thank you. We move on this evening, and to the investigation after the fall from a ferris wheel in tennessee. We have new reporting this evening about what might have caused that ferris wheel after it tilted and apparently got stuck. Tonight, authorities acknowledge there were mechanical issues. And many asking, was there no belt, no bar holding them in . Heres Abcs 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. Ive got three kids that fell from the ferris wheel. Three kids. Reporter investigators say as this orange cart carrying the 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 40 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 just landed 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. Reporter the big question here tonight is about seat belt there are no, by design, from the manufacturer, there are no seat belts. Reporter inspectors are now saying what happened was a mechanical issue. We took a look at rules on safety restraints at Amusement Park rides, 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 10yearold boy on a water slide. And this image this evening, a raft arriving at the bottom of that same slide last month. The rider in the back there without an 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. Abcs 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 shoulder strap came off last month. 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 and this 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. Slide injuries estimated last year alone. Kansas Officials Say 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. Heres abcs david kerley, getting answers. Reporter more long lines, delays and cancellations. A second day of the delta debacle. This is a bummer. Reporter tonight, thats led to those 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. There were so much screaming and yelling, i just had to get 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 didnt switch over to the backup power. Some did. And its systems are operating with some instability still tonight. From deltas ceo, a second apology. This isnt who we are. This isnt the quality of service and the reliability that youve 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. Theyre 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 pilot fire, some 60 miles east of los angeles, a number of and abcs Kayna Whitworth is on the fire lines tonight. Reporter david, the air quality here is so bad, that parents say it looks like its snowing ash. The fire jumping fire lines, prompting thousands more evacuations on monday night. Scorching nearly 7,000 acres, and sending smoke into nearby cities, forcing those school closures. Hand crews using fireproof gel drop retardant from the sky. Now, the firefighters say the wind is actually helping them push the fire away from residents, but the battle is on for that ridge that there. They say if they lose, thousands more are in danger. David . Kayna whitworth tracking the fire for us. Kayna, thank you. In the southwest tonight, a giant dust storm blowing over phoenix this afternoon. Visibility down to a quarter of a mile there. And then, flash floods hitting tucson today. Remnants of that tropical system. Lets get to rob marciano, tracking it all for us. Reporter david, after a short break, the southwest monsoon is back in action. Aided in part by some of the moisture from Tropical Storm javier. Could see one to three inches of rain fall, and mudslides, a possibility through thursday morning. Panhandle of florida, this stubborn low continues to spin. We saw nine inches of rain in one spot in the last 12 hours. Look for another five at least from perry, pensacola and new orleans. The folks that live in the big easy should prepare for a wet go and the possibility of flooding. David . Rob marciano with us. Rob, thank you. 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 but late today, we learned the u. S. Womens Gymnastics Team made that history, 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. And already, four days into the games, team usa still well ahead in the medal count. Abcs matt gutman, part of our team, right there in rio tonight. Reporter tonight, the womens Gymnastics Team living up to months of hype. They didnt just win, they 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 were used to seeing grinning with gold or in a celebratory flex, but now, scowling in the dressing room. Appearing to give his South African rival, who beat him four years ago, the death stare. Tonight, they are facing off in a rematch, phelps going for his 20th gold. Team usa headphones, cheering him on from the stands. Phelps won gold in the mens 4 x 100meter freestyle relay sunday. His teammate, ryan held, sobbing during the medal ceremony. So, a guy that doesnt cry almost ever cries twice in a day. Yeah. Thats what the olympics does to people. Reporter we met held today. I cried on the podium. And then Michael Phelps kind of put his arms around us, hes like, you know, ive been here 19 times before, like, i might start tearing up and crying just on this one. Reporter and a cold war rivalry heating up. Lilly king backing up her now 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 yulia efimova, previously suspended for 18 months for doping. And getting in one final cold warera dig in afterwards. We can still compete clean and do well at the olympic games, and thats how it should be. Reporter and more redemption 30yearold David Plummer becoming the oldest man to win a first medal in the olympics since 1912. David boudia and Steele Johnson making a small splash in synchronized diving. Coming from behind to win silver. Torquing and twisting in near perfect unison. They say this dive is their most difficult, in part because of their significant fiveinch height difference. Johnson is 62, boudia, 59. Crediting their success to sharing the same coach and learning the dives together. David, gymnastics competitions are often decided by a hundredth of a point. Tonight, the womens team won by eight full points. Now, in london, the womens team called itself the fierce five. Its new name seems to be wellearned the final five. David . The smiles and those gold medals late today. Matt gutman, our thanks to 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 near her 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. Lets just say authorities were gary, gary, gary. I am proud of you, my man. Making simple, smart cash back choices. With quicksilver from capital one. Youre earning unlimited 1. 5 cash back on every purchase, everywhere. Eps things simple, gary. And smart, like you and i like that. I guess i am pretty smart. Dont let that go to your head, gary. Whats in your wallet . Its the Phillips Lady anyone ever have occasional constipation, diarrhea, gas or bloating . [ simultaneously ] she does. Help defend against those digestive issues. Take Phillips Colon Health probiotic caps daily with three types of good bacteria. 400 likes . Wow phillips. Be good to your gut. Next tonight, we have new developments in the mystery death of a female jogger in massachusetts. The victim found near her parents home. The second female jogger found dead in a week. Abcs linsey davis, in that community in massachusetts, on edge tonight. Reporter hundreds of tips are pouring in tonight in princeton, massachusetts, as a community tries to solve a gruesome murder in their rural town. Were still approaching this from every angle. We dont know if this was a reporter 27yearold vanessa marcotte, a google employee, disappeared during an afternoon jog on sunday. Her body was found less than half a mile from her mothers home. Abc news has learned investigators are looking into signs of Sexual Assault and burns on her body. Doors are unlocked often, but not anymore. Reporter police in massachusetts havent ruled out a connection to the murder of karina vetrano, who disappeared while jogging last week in new york. The nypd was back in vetranos neighborhood last night, giv an update to residents desperate for answers. We have collected several pieces of evidence from the crime scene that are being forensically processed as we speak. Reporter now, two grieving families. Marcottes father told reporters that his daughter was not in a relationship with anyone. Authorities in massachusetts say they do not have a susp