Donald Trump Tries to Sweep Super Tuesday

The Republican presidential front-runner received backlash after failing in an interview to condemn the Ku Klux Klan.
2:38 | 02/29/16

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Transcript for Donald Trump Tries to Sweep Super Tuesday
We turn to the white house right now, "Your voice, your vote," just one day away from the critical super Tuesday contest. This he'll cast their ballots. Could make Hillary Clinton and Donald Trump unstoppable. Also have a brand-new poll out moments ago it shows trump with his biggest lead yet at nearly 50% across the country. ABC's Tom llamas has all the latest. Good morning. Reporter: Good morning to you as we just saw polls show Donald Trump may have a big night tomorrow but now he's dealing with a problem involving the kkk and the other candidates are all seizing on it. Wow. ? Wow, this is amazing. Reporter: Overnight, Donald Trump speaking to a massive crowd in Alabama, a super Tuesday state, but not mentioning a syllable about the controversy involving the Ku klux Klan and their former grand wizard David duke. Wow say you condemn them and don't want their support? Well, I have to look at the group. I mean I don't know what group you're talking about. I'm just talking about David duke and the Ku klux Klan here. I don't know -- I don't know David duke. I don't believe I've ever met him I'm pretty sure I never met him. Unloading on him by his rivals. We cannot be a party that nominates someone who refuses to condemn white supremacists and the Ku klux Klan. Trump later tweeting about David duke, I disavow and sending this clip from Friday. I didn't even know he endorsed me. David duke endorsed me. I disavow. This as trump's other rival senator Ted Cruz hammered him for not releasing his tax returns as he and senator Rubio have. There have been multiple media reports about Donald's business dealings with the mob, with the Pfaff Ya, maybe his tax returns show that those business dealings are a lot more extensive. Business dealings with the mafia. We don't know. And trump not the only one feeling the heat. Governor Chris Christie who endorsed trump struggled to defend some of the billionaire's policies. Are you saying now you endorse the ban on having N noncitizen muslims -- No, that's not what I'm saying. That's only one piece of an overall approach to national security. But you disagree with it. I said that very plainly. Listen, George, here's the bottom line, elections are choices. Reporter: And overnight, things continued to get ugly. Responding to trump dubbing him -- Little Marco. Rubio mocking trump for having small hands. You know what they say about men with small hands -- You can't trust them. You can't trust them. They say the republican race in a very strange spot right now.

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

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