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A recent Fox News poll revealed that Donald Trump is up 11 percent among likely Iowa Republican caucus-goers since early January.

On "Special Report" tonight, Charles Krauthammer said that Trump's rise in the polls - and Ted Cruz's decline - can be attributed to two weeks of Trump attacking his fellow GOP presidential contender.

Krauthammer declared that the two-week "cage match" between Trump and Cruz since the last GOP debate has been won decisively by Trump.

He explained that Trump has landed blows against Cruz by strongly disputing the Texas senator's "New York values" attacks, in addition to attacking Cruz's Canadian citizenship and his undisclosed loans from Citibank and Goldman Sachs.

"And now he's attacking him on his persona," Krauthammer added, pointing out that Trump is painting Cruz as a "nasty guy" who can't make deals and who nobody likes.

"It's had its effect. I think that 11-point swing one way - Cruz has dropped - is the result of this two-week match."

Watch more from the "Special Report" panel above.

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