On the red carpet, and behind the scenes. The controversy. The chris rock factor. And a beefed up oscar. The awards new look. And good evening. Thank you for joining us on this sunday. And we are counting down to the oscars tonight, and super tuesday, just two days away. The high stakes showdown. Republican frontrunner donald trump, under fire tonight. The race issue exploding. Critics demanding he denounce the ku klux klan. Marco rubio on a relentless attack, calling trump a conman. As ted cruz goes even further, suggesting trump wont release his tax returns because of possible mob ties. Abcs mary bruce starts us off tonight. Donald trump reporter tonight, donald trump on the defensive, forced to explain this answer when asked if he condemns the ku klux klan and its former grand wizard, david dukes call to vote for trump. Im just i dont know david duke. I dont believe ive ever met him. And i just dont know anything about him. Reporter the backlash was swift. His rivals pouncing. We cannot be a party who nominates someone who refuses to condemn the ku klux klan. We cannot be a party that does that. Reporter tuesded cruz tweet really sad. Youre better than this. Kkk is abhorrent. Trump fired back, noting this previous response. I didnt even know he endorsed me, david duke endorsed me . Okay, i disavow, okay . Reporter trump is poised to win big on super tuesday. Trump boost eed by his huge endorsement from chris christie. The new jersey governor was challenged today. You endorse the ban of having noncitizen muslims no, im saying thats only one piece of an overall i1 said that very plainly. Reporter with just two days until the next contest, the rival campaigns have turned into attack machines. Hammering trump for not releasing his tax returns, sp k speculating about what hes hiding. There have been multiple media reports about donalds business dealings with the mafia. Reporter trump says he plans to release the tax returns, julgs not now. And tom, marco rubio hoping to get more momentum heading into tuesday, but he has a long way to go. And making it harder, donald trump just nabbed another big endorsement. He now has the backing of alabama senator jeff sessions. Tom . All right, mary, thank you. Now, to the democrats. Hillary clinton, riding that wave of momentum into super tuesday. Clinton winning South Carolina by almost 50 points. Receiving huge support from a record turnout among black voters. Bernie sanders vowing not to give up the fight, promising challenge clinton until the very end. Abcs david wright with the Clinton Campaign in arkansas tonight. Reporter in nashville, today, a scene straight out of abcs scandal. The actor that plays the president made a show of telling her about Donald Trumps latest gaffe. You heard about his latest. What did he do now . He didnt know who david duke was. Oh, thats pathetic. Reporter clintons huge victory in South Carolina has put a new spring in her step, heading into super tuesday. She has more delegates and more momentum than Bernie Sanders, as sanders freely admitted to george. We got decimated, george. We got decimated. Reporter clintons mood, buoyant. Im actually kind of looking forward, if im fortunate enough, to be the nominee, deting any one of them. Reporter shes also pointedly making nice. Creating a contrast with some of the republican kindness. Reporter now, postof the super tuesday states are right here in the south, and that should play to clintons strengths. But it plays into the expectations game, so, if Bernie Sanders is able to score a few big unexpected wins, well, the momentum of this race could change again. Tom . And david, on that point, lets get right to abcs chief White House Correspondent jonathan karl. Jon, whats senator sanders path to stop clinton at this point . Reporter well, its a narrow path. He has to show that he can win in the south. And then, he has his eyes on the prize of california. The biggest delegate stake of all. Thats not until june, and if he doesnt do better before then, he will be out of it. Were less than 48 hours from the voting on super tuesday. Do you think this kkk controversy hurts donald trump . Reporter we dont know. On one hand, hes retweeted White Supremacists in the past this could be different. Look at the way his rivals poupsed on it and look at the way he felt a need almost immediately to come out and clarify to say, yes, i disavow. Republican primary voter will tolerate a lot, but i dont think they will toll rate outright racism. All right, jon, thank you so much. Stay with abc news for full coverage on super tuesday. Special editions of Good Morning America and world news tonight, George Stephanopoulos and the entire Powerhouse Political Team on the air, beginning at 10 00 p. M. Eastern, tuesday night. And we do move on now to virginia, the Deadly Police shooting making National Headlines tonight. A rookie officer shot and killed her first day on the job. Two other officers wounded. Her Police Cruiser today turned into a memorial. You see it there, with black bunting, a wreath placed on the hood. The alleged gunman, an army staff sergeant, assigned to the pentagon. Abcs Gloria Riviera on the investigation tonight. Reporter tonight, a Police Department in community it serves devastated by a shocking loss. Prince Ashley Guindon killed in the line of duty. When news came that she passed, it was it hit us. We werent expecting it at all. Reporter Authorities Say the officer responded to a 911 call, reporting domestic abuse. I just want to be clear. Do we have officers involved in a shooting . We have three officers that have been shot. Reporter it was here in this quiet upscale neighborhood that rookie cop Ashley Guindon and two others approached that front door. Police say almost immediately the suspect confronted them, opening fire, and they all went down. I saw the officer laying right there, holding his leg, i figure he got hot. Reporter neighbor zakhar ch harris saying he heard three gunshots. Assigned to the pentagon. Hamiltons wife was found dead inside the home. The two other officers are expected to recover. Now, officer guindons squad car, draped in black to honor the rookie lost too soon. Ronald hamilton is expected to appear in court tomorrow. He is facing two murder charges, murder in the first and capital murder, making him eligible for the Death Penalty if convicted. Tom snl. All right, gloria, thank you. Overseas now, the fragile ceasefire in syria. Reports of russian air strikes hitting targets in the cities of aleppo and raqqah. Syrian families caught in the middle, hoping the truce holding long enough for much needed humanitarian supplies to arrive. Abcs Alex Marquardt in the region for us tonight. Reporter air strikes today in northern syria. Just one of a growing number of incidents threatening this fragile truce. Both sides accusing the other of violating the ceasefire. But tonight, it has largely held the fight continues against isis and al qaeda, but in much of syria, theres a calm that hasnt been felt for years. Still at risk, the almost half a Million People living under brutal sieges. In one town, local doctors say dozens have died from starvation. We tried to visit today, with government permission, but were turned away, told that mortar and sniper fire made it too dangerous. But the United Nations is now trying to capitalize on the quiet, to ramp up deliveries of aid across the country. If the truce holds, they say, they can do more, better and faster. That will be tested tomorrow morning with the first convoys scheduled to go out since this temporary ceasefire started. Alex marquardt, abc news, damascus. Back here at home, a plane crash in pennsylvania. Take a look at this. The 87yearold pilot plunging into the trees, reporting engine trouble just after takeoff, suddenly trapped in midair. Abcs phillip menan ground. Reporter dangling from the branches, this small plane left hanging from a tree, nose down, after a frightening crash. The only person on the plane, the pilot. 87yearold herbert n 0bartell waiting hours to be saved. Authorities say he had just taken off and ran into trouble. He tried to do a uturn, but he lost control and it went into the trees. Reporter stuck up in the tree, bartell managed to call 911, but it took nearly four hours to get him down, because of all the branches in the way. He was in very good spirits the whole time there. He was conscious, alert, oriented the whole incident. Reporter bartell escaped with only minor injuries. Think by the end he was a little apg shus to get out. Reporter phillip mena, abc news, new york. Now, to a troubled cruise ship back in the headlines. Anthem of the seas, the ship damaged after sailing into hurricaneforce winds earlier this month, fce around midtrip this weekend, returning to new jersey because of a severe storm in its path. And now to hollywood. The Academy Awards about to get under way tonight. The star Power Building on the red carpet. The biggest celebs in the business about to arrive. Everyone picking their favorites to win. Abcs amy robach at the dolby theater. Reporter hello, tom. Were right here in the thick of it. The movers and shakers of the Film Industry and the stars are starting to make their way in and we congratulate all of the nominees. But this year, so much of the attention is on those who were not nominated, the lack of diversity among the nominees, setting off a firestorm. Host chris rock making it clear, he will not shy away from the controversy, tweeting, see you sunday blackout oscars so many are wondering, just how far he will go. Were going to have it all and were going to have nominees, of course. And, all in our oscar preshow countdown to the oscars. Thats coming up, right after world news tonight, tom. Robin, thank you so muchlt of course, that was Robin Roberts, not amy robach. Much more coming up on the oscars later. Still ahead tonight. Danger on the roadways. Drivers forced to do more than keep their eyes on the road. Debris frying right at them. How to stay safe. And protests erupting in an american city. The Police Shooting sparking outrage. The investigation under way. What if one piece of kale could protect you from diabetes . What if one situp could prevent Heart Disease . One. Wishful thinking, right . But there is one step you can take to help prevent another serious disease. Pneumococcal pneumonia. 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And his whole sheet came off and just shattered our windshie windshield. Reporter luckily, no one was hurt. But tom, driving on an indiana highway last week, came inches from death. Its a little sore. Reporter when a fivepound metal spring came off a semi, sailing through his windshield. It happens more than you think. Debris triggering roughly 50,000 crashes a year. Claiming nearly 450 lives. To prevent accidents like this one, caused by a mattress landing in the road, experts say the best thing you can do is be increase your following distance. Make sure that no vehicles are beside you, which gives you ample room in case you have to veer into another lane. Reporter and if you dont have that escape route, experts say the best thing to do is to drive through that debris and try not to slam on your brakes. Tom . Linzie, thank you. When we come back, a halftime show surprise. What was in this giftwrapped box that had one little boy jumping for joy . An arena full of basketball fans on their feet. And this years oscar statues. The winners may notice a change. Why oscars looking a bit more buff. With my moderate to severe ulcerative colitis, the possibility of a flare was almost always on my mind. Thinking about what to avoid, where to go. And how to deal with my uc. To me, that was normal. Until i talked to my doctor. She told me that humira helps people like me get uc under control and keep it under control when certain medications humira can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get tested for tb. Tell your doctor if youve been to areas where certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. 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Enjoy the relief. Back now with our index. Starting tonight with a violent protest in as a matter of fasal. Police say they were trying to break up a fight between two men when one of them allegedly attacked an officer with a broomstick. That person, a 16yearold black male, was shot and is now in critical condition. Shortly after, an angry crowd began hurling rocks at police. Several arrests were made. Several witnesses are being questioned as the case are under investigation. The mayor calling this a tragedy. Reporter turning to sports now. A record night on the basketball court. The Golden State Warriors steph curry launching the gamewinning shot from about 35 feet away. Remarkable. Less than a second left in overtime when that happened. And curry breaking the record for most threepointers in a season with 288, tying the record for most threepointers in a game last night with 12, and beating Oklahoma City along the way. Even other nba stars stunned. Lebron james saying never before seen anyone like him in history. Hes having a great season. N in gifts by his favorite basketball team. The phoenix suns wanted to cheer him up, who had been missing his father, soldier deployed for a long time. Then, came this big box. And guess who popped out . Daddy that reaction. That hug says it all. The crowd erupted watching the emotional reunion. No doubt, the best present ever. Now, to the Academy Awards and it looks like oscar may have a personal trainer. The actual statue is getting a makeover this year. Theyve been revamped with more muscles, refined jaw line and hairline. Looking good. The subtle features loom more like the original statues did in 1929. They will also be hand cast in bronze, like the originals, before getting that 24 karat gold finish. And more oscars ahead. Those acceptance speeches. Tonight might be a little different, and a little shorter. Turning up the music never really works when the oscar winners are in the moment. 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Finally tonight, youll notice Something Different at the oscars when the winners give their speeches. The a plan, but are the stars really going to go for it . Abcs Chris Connelly with the story. Jen for connelly. Reporter an oscar win is a big moment in anyones life. Like when jen for connelly won supporting actress in 2002. You dont want to forget anyone. Still, nothing sinks the heart of an oscar producer like a litany of thank yous. Thank you to all of our magnificent cast and crew for their invaluable collaboration and most especially to ron howard and russell crowe. There was al pacino, winning in 1993. If you indulge me for a moment, i had to write this down. Reporter not every winner has pacinos star power. So, some get played off. As will farrell and jack black famously sang no need to thank your parakeet youre boring look at katherine shes snoring reporter this years oscar producers hope theyve hit on a plan to perk up 2016s 45second acceptances. A scroll at the bottom of the screen that will name all the names a winner needs to thank, as they explained to lara spencer. And they dont have to fumble with a list. They dont have to find the glasses. Oh, my god. Its like, look. You can thank more people, you can thank the same people. Thank your cat. Make a statement. Reporter the hope is for unmistakable moments of emotion and deeply felt appreciation. The kind that have become part of oscar legend. Who could forget cuba gooding jr. . I just want to oh, here we go. Okay, the studio, i love you, and Cameron Crowe and tom cruise i love you, brother i love you, man reporter and if the orchestra never has to play anyone off the stage, audiences around the globe will all be feeling, well, really grateful. Angeles. And we hope for many moments like that tonight. Well, the excitement is building for the Academy Awards. The red carpet starting to fill up. Dont miss Robin Roberts preshow oscar special coming up, and then the 88th Academy Awards right here on abc. A complete wrapup of the or kafrs on gma tomorrow morning. David muir right back here tomorrow night. Im tom llamas in new york. Have a great evening. New details in a double tragedy in woodbridge. She lost her life for my nephew and sister. I thank you and god bless your family. Two women killed, including a police officer. We are learning more about the victims and the man accused in their murder. This is a friend and coworker. And how the prince Williams CountyPolice Department is honoring their fellow officer tonight. The news starts now. [captioning performed by the national captioning institute, which is responsible for its caption content and accuracy. Visit ncicap. Org] be clear, dot to