Ted Cruz and Donald Trump Duke It Out for Republican Nomination

The two leading Republican candidates exchange blows a few weeks before the Iowa Caucus.
2:49 | 01/19/16

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Transcript for Ted Cruz and Donald Trump Duke It Out for Republican Nomination
And we begin tonight with the final sprint to Iowa. Two weeks left now. On the republican side tonight, a war of words between the two men battling for that all-important first state. Donald Trump calling Ted Cruz a nasty guy, saying, no one likes him. And Ted Cruz tonight firing back, saying Donald Trump is clearly getting rattled by Cruz's strength in Iowa. And tonight, some well-known conservative voices have a message of their own for trump. ABC's Tom llamas is in Iowa tonight, leading us off. Reporter: Just hours after taking aim at senator Ted Cruz, Donald Trump today quoting scripture at jerry Falwell's evangelical liberty university. Two corinthians right? Two corinthians 3:17, that's the whole ball game. Where the spirit of the lord, right? Where the spirit of the lord is, there is liberty. Reporter: But on "This week," Nobody likes him. Reporter: Trump also blasting Cruz for slamming Wall Street while failing to disclose he took out a million dollars in big bank loans to fund his senate race. Oh, he's a total hypocrite. That he's the one protecting the people from the banks when he's actual labor roeing money and personally guaranteeing it and not disclosing it, which is illegal. Reporter: Today, Cruz tweeting this video in response to being called nasty. getting under trump's skin. He seems to be a little rattled. Reporter: But his campaign hammering trump's quote "New York values" all weekend releasing this 1999 video, trump in his own words. I lived in New York City and Manhattan all my life. So, my views are a little different than if I lived in Iowa, perhaps. I'm very pro-choice. And again, it may be a little bit of a New York background. Reporter: That message now hitting home. Today some prominent conservatives questioning trump. There are a lot of conservatives who think that he's a wolf in sheep's clothing. That he's a traditional, lifetime new Yorker. And that means something. There are all kinds of conservatives with suspicions of Donald Trump. And Tom llamas is now live from inside Cruz headquarters in Des Moines. Tom, Ted Cruz, Donald Trump are head a neck and neck in Iowa. What is the ground game? Reporter: Take a look. Every single person is on a phone. They hope to make 12,000 calls a day here in Iowa. And staffers and strategists are convinced this is how you win the hawkeye state, with the ground game. That said, trump is here tomorrow. Three stops, including his first stop, which is in John Wayne's hometown. He's hoping to make the argument he's the gop's real hero. All right, Tom, thank you. To the democratic side tonight, where there is also a

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

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