Donald Trump Has a Ben Carson Problem in Tonight's Debate

How can Trump effectively attack a rival who has pledged not to swing back?

Ben Carson Readies for Trump Attacks

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For Donald Trump, it is an unfamiliar position. With Wednesday night's Republican presidential debate just hours away, he finds himself no longer at the top of the polls and uncertain of whether his verbal attacks on a rival will pay off.

Trump's likely target, retired neurosurgeon Ben Carson, has pledged not to take the billionaire's verbal bait at the CNBC debate, which starts at 8 p.m. ET at the University of Colorado at Boulder. That sets him apart from those who have engaged with his combative rhetoric but failed to put a dent in his populist momentum, leaving Trump with a quandary.