Donald Trump on Second Place Standing in Iowa: 'I Said I Don't Believe It'

ABC News' Tom Llamas reports on the latest back and forth between Ben Carson and Donald Trump as they race toward the White House.
1:54 | 10/25/15

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Transcript for Donald Trump on Second Place Standing in Iowa: 'I Said I Don't Believe It'
Things also heating up on the republican side. Latest polls show Ben Carson taking the lead from Donald Trump, but trump is still nationwide. He'll join us live after this report from Tom llamas. Reporter: For the 3,000 who turned out to hear Donald Trump in Florida Saturday, a different message from the brash billionaire. I'm number two. In Iowa. I said I don't believe it. Reporter: Trump, who likes citing his lead in the polls, now raising questions about them. After two new polls show him slipping to second place in Iowa and trump taking new shots at the man in the lead, Ben Carson. Carson is controlled by his past. Carson is lower energy than bush. Reporter: But it was this comment referencing Carson's religion. I'm presbyterian, that's down the road, folks. I mean seventh day adventist. I don't know about. Reporter: That has the former neurosurgeon calling for an apology. You know, a couple of months ago I said something that he took as an attack on his faith and I apologized for that. I hope he will have the same grace. Reporter: The trump/carson showdown one to watch. Another, can Jeb bush make a comeback? The man who just months ago was the front-runner, slashing his campaign's payroll by 40% on

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

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