Donald Trump Unleashes on Ted Cruz

As the race between the Republican presidential candidates grows tighter, both escalate attacks.
3:26 | 01/18/16

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Transcript for Donald Trump Unleashes on Ted Cruz
And the republicans going at it as well. Absolutely. The attacks are escalating between trump and Cruz. The billionaire with his hardest hits against Cruz as the race between them grows even tighter. ABC's Tom llamas is here with details on that. Good morning to you. On Twitter and on TV trump is telling people Cruz is a natural born Canadian. Cruz dismissing that as a side show and launching his attacks showing trump is no true conservative. This morning there's no mistake how Donald Trump feels about the man hoping to beat him in Iowa. Senator Ted Cruz. Look, the truth is he's a nasty guy. Trump telling George Cruz is a hypocrite for railing against big banks even though he took loans from them to fund his campaign which the fec safes he failed to properly report. He wants to look like robin hood. He's the one protecting people from the banks but he's borrowing money and not disclosing it which is illegal. Cruz sticking with his attack that trump embodies New York values tweeting out a link from the 1999 trump interview. I'm very pro-choice and it may be a bit of a New York background because there is some different attitude in different parts of the country. I was raised in New York and fwru grew up and work in New York City. A lot of conservatives think maybe he's going to switch again. It doesn't matter what they think. They understand me. They understand trade. I don't consider myself to be anything. Overnight a super pack supporting Ted Cruz putting out a video again using trumps own words. This time from a fundraiser where the billionaire showed support for Cruz. He is now in very, very popular and important figuring in all of our lives. And on top of those videos Cruz is also actively trying to poach trump supporters. Yesterday he told people at his town hall if they know someone voting for trump, simply ask them have you ever been burned by a politician. George, it's getting good. Let's talk about it now with our political analyst Matthew dowd. Let's start with the trump/cruz battle. Down to the wire in Iowa. Trump releefasing the attacks and Cruz suggesting trump is a liberal. Who is getting the better of this argument? George, it's gone from stand by me to gangs of New York in the course of three days. I think in the end no one benefits from this. But I think that Donald Trump comes out the winner, he starts ahead in every single state except for Iowa. The other person I think that might benefit from this is Marco Rubio. He's out of the battle and fire and he may be able to rise a little in the establishment lane. But right now I think the cruz/trump fight doesn't benefit either one. How about the democratic debate last night. I think everybody did fine. I think Hillary stood well in the course of this. I think what's going to change this race is Iowa. We saw that in 2008 the caucus results in Iowa, Barack Obama was behind Hillary Clinton and wins aye wiowa and the race closed. I think Bernie sanders is counting on in the course of this. The debate was everybody did fine but Iowa mattered. It does. Two weeks from today.

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

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