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CLEVELAND, OH - AUGUST 06:  Republican presidential candidates Donald Trump (R) and Wisconsin Gov. Scott Walker participate in the first prime-time presidential debate hosted by FOX News and Facebook at the Quicken Loans Arena August 6, 2015 in Cleveland, Ohio. The top-ten GOP candidates were selected to participate in the debate based on their rank in an average of the five most recent national political polls.  (Photo by Chip Somodevilla/Getty Images)
CLEVELAND, OH - AUGUST 06:  Republican presidential candidates Donald Trump (R) and Wisconsin Gov. Scott Walker participate in the first prime-time presidential debate hosted by FOX News and Facebook at the Quicken Loans Arena August 6, 2015 in Cleveland, Ohio. The top-ten GOP candidates were selected to participate in the debate based on their rank in an average of the five most recent national political polls.  (Photo by Chip Somodevilla/Getty Images)

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    Trump on top in new polls from Iowa, New Hampshire

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Trump on top in new polls from Iowa, New Hampshire

Republican presidential candidate Donald Trump takes Scott Walker's place as the leader in Iowa, according to a recent poll.

Trump on top in new polls from Iowa, New Hampshire

Republican presidential candidate Donald Trump takes Scott Walker's place as the leader in Iowa, according to a recent poll.