Chris Christie Endorses Donald Trump

New Jersey governor says Trump is the best choice to beat Hillary Clinton.
4:42 | 02/27/16

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Transcript for Chris Christie Endorses Donald Trump
And a major turn the race for president tonight. Just hours after that knock down drag out debate Marco Rubio and Donald Trump unleashing blistering new attacks worse than last night. If that's possible to imagine. And Donald Trump revealing his newest weapon today governor Chris Christie and the surprise endorsement saying he's now behind trump for president. The debate last night trump in the middle taking incoming fire from both sides but many now asking with trumpet headed nearly every state on Super Tuesday. Where were these attacks from his opponents months ago. Are they too late. ABC's Jonathan Karl from Texas with the new fight playing out tonight. Facing harsh unrelenting attacks from Marco Rubio Donald Trump tonight rolled out his biggest endorsement yet. Well there's a lot of press political brawler a tough guy New Jersey governor Chris Christie I can guarantee you. That the one person that Hillary and Bill Clinton do not want to see on that stage. Come next September is Donald Trump. They know how to run the standard political playbook against junior senators. And run them around the block. They do not know the playbook with Donald Trump because he's rewriting the play book. Christie is also the guy who pummeled Marco Rubio the ABC news New Hampshire debate in two day he called rubio is new tough tone. Desperate desperate people campaign's efforts desperate things flailing punches in the last days. Off a losing campaign there is no better fighter. And Donald Trump but it sure looked like rubio at trump on the ropes last night mocking him for repeating simple talking point on health. Care we should've gotten rid of the line should have gotten rid of the lines around the states we have to get rid of the lives around the states but I was repeating himself not Rodrique. It's O five times. Score weeks ago I like your ideas all quiet on the second ago. De rubio sounded like an entirely new candidate. Launching trump like attacks against trump. Last night in the debate during one of the breaks to all the breaks it went backstage. This little makeup thing applying like make up a rabbit must after the I want a slight mustache then. Benny asked for a bullet mirror I don't like at the podium goes up here but he laughed bullet man. Maybe it makes earth perhaps more wet I don't know. We asked trump about that he actually suggested that you were sweating backs needs that you see rabbi I'll tell you about backstage amenities like. I walked back PRD's where they pile of make up putting enormous space is at marked up easy with that make up you don't need that much but not heard he had some very nasty personal comments. I saw him backstage and he was putting it on with a. Owls later troupe performed an odd impression of that infamous moment when rubio reached for his water bottle on national television. It's a rubio now. I. Rubio clearly incurred the wrath of trump. After ripping into him. It on the debate stage when you the only person on the stage it's ever been fine for hiring people to work on your projects illegally hired some former world until then what is the stage it's hired people you haven't hired. Okay. And I'll I hired. Thousands of people love my job you writing 100000 people at night that they Albany problem another country guards and set. Like Ted Cruz chime did too when I was leading the fight against the gang of eight amnesty bill. Where was Donald. He was firing Dennis Rodman on Celebrity Apprentice. Prompting Dennis Rodman tweet yes Ted Cruz Donald Trump did fire on Celebrity Apprentice he's about to fire your bowling to. Crews got under Trump's game. Donald relax I'm relaxed. I get an embezzlement case god. Go ahead don't get news. I prosecuted. Nothing about it yeah. There you. But tonight it's clear the race is now a battle Donald Trump. Newly aggressive Marco Rubio. It's time holds. Let me. Cop cars. With blast today Jon Karl with a slot tonight from Texas and John. You heard we sit at the top here a lot of people asking tonight where were these attacks months ago is the eleventh hour right before Super Tuesday too late. That's one of the biggest questions of this entire campaign. For months and months Marco Rubio didn't lay a glove on Donald drop while he built up by titanium. Strong core of support was Super Tuesday four days away David. It may just be too late all right Jon Karl in Fort Worth, Texas tonight John thanks.

This transcript has been automatically generated and may not be 100% accurate.

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