Donald Trump admitted Monday that he doesn't understand how he lost the lead to retired neurosurgeon Ben Carson in Iowa.

"Some of these polls coming out, I don't quite get it," Trump told MSNBC. "I was number one pretty much in Iowa from the beginning. And I would say we're doing very well there so I was a little bit surprised."

"This one I don't quite get," he added. "I would have thought we are doing much better. I think we are doing much better."

Trump said as the new leader in Iowa, Carson would have to withstand more scrutiny, and then applied some of his own.

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