Cruz 10 Points Ahead of Trump in Iowa

ABC News' Jonathan Karl has the latest on a brand new poll from the Hawkeye state.
3:06 | 12/13/15

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Transcript for Cruz 10 Points Ahead of Trump in Iowa
And we come on the air this week to a major shakeup in the race for the white house, a brand-new poll just released by "The Des Moines register" shows Ted Cruz blowing by Donald Trump in the key first state of Iowa. There you see the Numbers. Cruz now at 31%. Ten points ahead of Donald Trump. The third outsider in this race, Dr. Ben Carson, falling hard from his first-place showing in October, he joins us live in a moment. But we begin with more on this stunning poll and a defining week in this campaign from Jon Karl at the white house. Good morning, Jon. Reporter: Good morning, George. It's just 50 days until the Iowa caucuses, and while Donald Trump still has a commanding lead nationally, Ted Cruz has the lead in the state that gets to vote first and republicans are gunning for him everywhere else. Is this the week the republican party came undone? It was pretty brutal four days ago for trump. Reporter: On Monday, he announced his most controversial plan yet. Donald J. Trump is calling for a total and complete shutdown of muslims entering the United States until our country's representatives can figure out what the hell is going on. Reporter: Party leaders denounced the proposal as not just wrong but un-american. What was proposed yesterday is not what this party stands for and, more importantly, it's not what this country stands for. Reporter: Every candidate in the race not named trump opposed the plan. Jeb bush even called trump "Unhinged." I'm not one of these other guys that goes down. I don't go down, I go up. Do you have a warning for gop leaders? I say, folks, you know, I'm sorry I did this to you. You got to get used to it. Reporter: Now the latest poll out of Iowa shows that senator Cruz ten points ahead of trump in the hawkeye state. Cruz was caught on tape obtained by "The New York times" caught -- Who am I comfortable having their finger on the button? Now that's a question of strength but it's also a question of judgment. Reporter: This caused trump to take a subtle swipe at Cruz. I do like Ted Cruz, but not a lot of evangelicals come out of Cuba. In all fairness. That's true. Reporter: Ben Carson threatened to leave the party after the Washington post reported that gop leaders discussed whether trump can be stopped at the party's convention. I don't think the party should be doing anything that's deceptive and under the covers and thwarts the will of the people. Reporter: A party in disarray, setting the stage for the last republican debate of 2015 in just two days away. Trump's Iowa problem has been brewing for some time, back in October, it was Ben Carson who was in the lead and if you remember, back then, George, trump responded by saying, how stupid are the people in Iowa? It turns out, perhaps insulting the voters of the state may not be the best way to win them over. Let's get more on this

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

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