The amtrak train derailing. Passengers screaming for help. What the engineer saw ahead of him. And, tonight, right here, the video. The Young American captured, accused of fighting for isis. Good evening. And its great to have you with us as we start another week here and we begin tonight with the race for the white house. And what could happen tomorrow on both sides. Could donald trump effectively wrap up the nomination . Tonight, trump and his new defense, arguing his rallies are not violent. In his words, theyre a love fest. It comes after tense moments on that ohio stage. Trump looking unsettled himself. The secret service rushing to protect him. A protester trying to jump onto the stage. And, of course, the violent clashes in chicago. Donald trump with new reaction to that tonight. And sarah palin now defending him. And the new polls this evening. In ohio, donald trump tied in one poll with governor john kasich. Marco rubio in his home state easily. So, tonight, if trump wins ohio and florida tomorrow, is this nearly done . Abcs tom llamas leads us off from youngstown, ohio. Reporter tonight, donald trump casting his raucus rallies as kumbaya sessions. Im a peaceloving person, folks. We love peace. We all love peace. Theres no violence. Theres lovefest. These are love fests. Reporter today, a very different trump from the candidate fired up against those from test or the protesters. If you see somebody getting ready to throw a tomato, knock the crap out of them. And they started punching back, it was a beautiful thing. Id like to punch them in the face, ill tell you. I promise you, i will pay for the legal fees. Reporter some recent trump events seeming more like riots than rallies. In chicago, fist fights. In kansas city, police using pepper spray. And in North Carolina, this trump supporter charged with assault after sucker punching a protester. Bills. The man got carried away. He was 78 years old. He obviously loves this country. And maybe he doesnt like seeing whats happening to the country. Ive actually instructed my people to look into it, yes. Reporter at times, the violence, even startling trump himself. Grabbing his podium when a protester rushed the stage in dayton, ohio. The secret service jumping into action. Trump later tweeting the pro test or the, quote, has ties to isis. Turns out that was a hoax. But today, security visibly tighter, as top trump supporter sarah palin defended him. What we dont have time for little thuggery stuff thats been going on with these quote unquote protesters. Reporter but trumps rivals this country is not about us tearing one another down or having fist fights at campaign rallies. Rubio and ted cruz both pointing out how they handle protesters at their events. Oh, look, a Bernie Sanders sign. Dont worry, youre not going to get beat up at my rally. Isnt it amazing that we can have that conversation, without anybody getting violent, without anybody insulting anybody . Reporter but the candidates now faced with a dilemma, having all pledged to support trump if rubio sounding anguished when asked if hell stand by that promise. I dont know. I still at this moment continue and intend to support the republican nominee, but getting harder every day. Reporter but no such hesitation from cruz. At the outset of this campaign, i committed i will support the republican nominee. And i honor my word. And tom llamas joins us live from ohio tonight. And tom, you talked to a lot of Trump Supporters today and they told you theyre not bothered by the violent scenes erupting . Reporter thats right, david. Many of those supporters in the and not a single one i spoke to hold donald trump responsible for the violence at his rallies. One woman told me that donald trump can say anything, i will vote for him. Another man told him that there are instances that Trump Supporters should fight back against those protesters. David . Tom llamas, thank you. And you saw sarah palin in toms report there. Suddenly canceling the rest of her appearances, after palin received word that her husband, todd palin, was seriously injured in a snowmobile accident. Tonight, weve learned he is in intensive care. Palin returning home to alaska to be with him. Were going to turn next here to the democratic side tonight, and to a critical moment for Hillary Clinton. Can she finally close the deal, or will there be another surprise like michigan . Overnight, during a town hall, mrs. Clinton acknowledging shes not very good at this part of it, the campaigning, and went on to explain why. Youll hear from her in a moment. Meantime, a confident Bernie Sanders fueled by michigan, hoping for another upset against clinton. And tonight here, a new poll slight edge in ohio, but that lead even smaller than what the polls showed going into michigan. Abcs cecilia vega with the clinton acknowledging her weaknesses on the trail. Reporter Hillary Clinton in chicago, turning an attack on donald trump into a campaign rallying cry. That people who run for president ought to unite our country, not divide our country. Reporter but before trump, Bernie Sanders, now closing the gap in ohio. A few weeks ago, people were saying, Bernie Sanders winning ohio . No way. Reporter encroaching on clintons lead. We have a good vote tomorrow, people come out, were going to win here in ohio. Reporter a Buckeye State loss not enough to block clintons path to the nomination, but it would be an embarrassing setback. And a reminder of the vermont senators strength among young voters. Snl this weekend joking that to win over that coveted group. I know you little len yalls. Youre fired up. Youre angry. And, im angry, too. Because the top 10 of the top 1 control 90 of the wealth in this country. And ive always said that. Reporter clinton admits, she still struggles to connect with some voters insisting shes not a natural campaigner like her husband or president obama. Campaign. I watched president obama campaign. It is poetry. I mean, it is just i mean, i get carried away and ive seen them a million times. You know . I go, oh, my gosh, you know . Both of them. You know, thats not necessarily my forte. Reporter and Hillary Clinton isnt the only one with a lot riding on tomorrow. Bernie sanders needs to win states and he needs to win delegates in order to stay in this race, and that is why he is outspending clinton in tv ads in every state except for one heading to the polls tomorrow. Cecilia vega with us tonight. Thank you. Lets get right to Abcs Jonathan Karl tonight with the bottom line here. The two states that could determine it all on the republican side. If donald trump wins florida and wins ohio, will he be the nominee . Reporter david, weve done the math. And by our calculations, if trump wins both ohio and florida tomorrow, he will be well on his way to clinching the republican nomination. Hell still need to win 54 of all delegates going forward, but that will be much easier as both marco rubio and john kasich would almost certainly drop out after losing their home states. Trump would be well on his way, as you point out. Let me ask it this way. If trump loses ohio, say to john kasich, then what do we have . Reporter well, if he loses ohio, and the latest polls do give john kasich a slight lead there, it makes it highly likely even probable that he would have to fight to get the nomination all the way to a contested Republican Convention this summer in cleveland. All right, jon karl with us tonight. Jon, well see you tomorrow night. Caught our eye, Hillary Clinton, critique of the bush administration, and then this image just surfacing today. Sharing an embrace, forrer president george w. Bush there hugging and latching with clinton before Nancy ReagansFuneral Service last week. Former residents of the white house, perhaps with more in common than we often think. And stay with abc news for night tomorrow. A pivotal night ahead. And team coverage, wednesday america and, of course, right here on world news tonight. In the meantime, we move on this evening, and to the other major headline. The tragic death of a young maryland officer, in a gun battle, right outside the police station. Officer jacai colson, under cover and out of uniform at the time. The police saying that a shooter, who wanted to die, started the gun fight with police, his brothers allegedly recording the whole thing. But late today, we learned that another officer might have shot him accidentally. Heres abcs senior justice correspondent pierre thomas. Reporter this is the man police headquarters, trying to ambush officers. Police say the suspect, michael ford, apparently wanted to commit suicide, and in a bizarre twist, his two brothers were there with him, recording the ensuing gun battle on their cell phones. During the fire fight, undercover officer jacai condon was critically wounded. Transported to a local hospital. His fellow Officers Holding hands, praying he would survive. He did not. And in a tragic turn, police disclosed that officer condon was killed by friendly fire. We believe the fired round that led to detective colsons death was fired by one of his fellow Prince Georges County police officers. Reporter today, a police own. A veteran fouryear officer with an outstanding record. A squad car draped in black to honor him. As for the suspects motive, thats unknown. But police say he had a mystery of mental illness. So many unanswered questions. Brothers didnt stop the suicide attempt, but instead record it. David . Pierre thomas in maryland tonight. Pierre, thank you. Next, from south carolina, a guilty plea tonight in a racially charged shooting there. We reported before on this dash cam video, showing the white trooper shooting a black driver outside a convenience store. The trooper demanding that drivers license, but when he reached into his car to get it, the trooper fired four shots. The driver survived. Today, the trooper pleading guilty, led away in handcuffs, now facing up to 20 years behind bars. Next here this monday night, to the dangerous weather on the move at this hour. A tornado touching down near dayton, ohio, reports of damage coming in now. More than 130 cars in a massive pileup in North Carolina along one rainy stretch of i40 in the last 24 hours. And in texas tonight, an entire town cut off by the water, forcing families from their homes. Abcs matt gutman is there with those families, and where this to save in this small town turned into a big lake, deweyville, texas, residents in saving themselves. Early this morning, some remaining holdouts heading out. Bad. Reporter bad . The sheriff now frantically focusing on those still there, despite a mandatory evacuation. A lot of folks already too deep. Reporter we climbed aboard a National Guard truck with Sergeant Anthony ross of the knew on the county sheriffs office. The only wail to get in or out is in a truck like this that is someone being rescued right now. Deweyvilles demise comes after a weekend that spawned tornadoes in arkansas. And a week long deluge that damaged 5,000 homes in louisiana and killed at least six in the region. And this is what it looks like today. Unfortunately, nothing has been able to stop that water. It is rising and it is expected to rise several more feet. Able to get to their homes here for several weeks. David . All right, matt gutman in texas for us. Matt, thank you. Lets get right to ginger zee, who is tracking the system and where it is going next. Reporter right. Weve got to get straight to the maps, david. You can see the upper level low that is in parts of kentucky and ohio, thats what spun up the tornadoes already. Thats moving to the east tonight. And along the stationary front attached to it, you can see tomorrows that could be severe from virginia down through North Carolina. So, well watch that just overnight tonight. But throughout tomorrow, and the next day, were watching this winter storm in the northern rockies, wind advisories, california to kansas. That thing is going to slide into the midwest and great lakes and bring chicago, indy, peoria, ft. Waine, all the chance for strong winds later tomorrow afternoon, about 5 00. So, supper time. Large hail possible, too. On the watch. Now that the dangerous weather is out of the way. I can say welcome back. Reporter thank you. So good to be here. Thanks, ginger. To other news this evening, and around the world. Russia changing course in syria president Vladimir Putin reporting at least some Russian Troops to withdraw. Instead, committing his country to a greater role in peace talks now. Russian forces have been bombing enemies of syrias government for five months now. A ceasefire brokered by the u. S. And russia has mostly held for two weeks, but hopes that negotiations will end the countrys bloody civil war remain dim tonight. Back here at home this evening and to a terrifying amtrak derailment. It happened in kansas in the middle of the night. Eight cars jumping the track. 145 people onboard, tossed around, dozens of them taken to the hospital. Officials now saying that toll might have been much worse if the engineer hadnt stopped the train when he did, because of what he saw up ahead. Abcs alex perez, at the scene. Reporter tonight, federal investigators on the ground in ks, trying to figure out what sent this amtrak train flying off the tracks. A train derailment, unknown amount of patients at this time. Reporter it was just after midnight, the train carrying 145 angeles to chicago. Then, the engineer notices a significant bend or defect in the track and hits the brakes, following protocol to avoid a bigger disaster. But eight cars still come off. Horrified passengers suddenly tossed around inside. Next thing i know is, i just feel the train lift off the ground and it is back down on the tracks, and then it does it again. It lifts up and slams me into the door. Reporter more than 30 passengers taken to the hospital. Two with critical injuries, air lifted. And david, investigators zeroing in on the condition of the track. Reportedly checking if an unreported vehicle track may have damaged the tracks. David . Alex perez in kansas. Thank you. There is still much more ahead on world news tonight this monday. The new Health Concern for patients leaving the hospital. The invisible risk, the super bug you might be taking with you. Also tonight, firefighters injured at the scene of this burning townhouse. Look at this. Of them. Also, brian ross standing by tonight. The new pictures. The Young American captured here, accused of fighting for isis. And then, march madness begins. College teams celebrating their invitation to the big dance but the investigation tonight. Someone leaking the secret list before the names were revealed. Well be right back. Cept im not 22. I accept i do a shorter set these days. P i even accept i have a higher risk of stroke due to afib, a type of irregular heartbeat, tnot caused by a heart valve problem. But i wont play anything less than my best. So if theres Something Better than warfarin, im going for it. Eliquis. 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Say the 26yearold wrongway jihadist, acknowledged his mistake and his citizenship. Where are you from . United states. Reporter and in another battlefield security miscue, the kurds found him carrying a virginia drivers license and credit cards, identifying him as Mohammed Khweis of alexandria, virginia. Outside that address in suburban washington, d. C. Today, just 12 miles from the white house, two members of the family became upset with reporters and then turned the water hose on them, denying anyone in their family isis. Watch your mouth no, no, no. Reporter this Young American captured on the battlefield, one of some 250 believed to be with terror groups in iraq and syria, will likely now be sent home to virginia in handcuffs, david. Brian ross with us tonight. Brian, thank you. And when we come back here on a monday, the alert over super bugs tonight, and patients leaving the hospital. The new medical headline. 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Dorothy houston, a senior, had married her high school sweetheart. It was against the rules, and she was never given that diploma. She raised five children, and taught them the importance of an education. Mother reporter 74 years later, on her 93rd birthday, she thinks shes going for a walk with the family. Instead, outside, the super unten dent of schools im mother to present you with your North High School diploma. Oh. All right . Mother made it very clear that the worst decision she ever made in her life was to leave school. And she was no regretful of that. Reporter tonight, dorothy has that diploma, and her cap. A diploma that finally arrived on her 93rd birthday. Happy birthday to you and we salute dorothy right here tonight. Thank you for watching on a monday night. Im david muir. I hope to see you right back work it out. Easy ways to train like the pros. Three exercises that you can do at home. Thats exactly it right there. Apps that will put your fitness back on track and earn you money. My thighs are getting smaller, and my wallet is getting bigger. Plus, why hundreds want the job of taking care of this tortoise. Hello, welcome to the show. Im theresa. And im donna. Lets count down the three stories at the top of the list. In the newsroom, here is bradley. Thank you, guys. As families flock to see utopia in theaters, a movie parents need to make time for