Ten Republican presidential candidates - Donald Trump, Ben Carson, Marco Rubio, Jeb Bush, Carly Fiorina, Ted Cruz, Mike Huckabee, Chris Christie, John Kasich and Rand Paul - faced off in Boulder, Colorado, for the third GOP debate.

For the first question of the debate, John Harwood noted some of Trump's more controversial campaign promises, including his tax plan, a wall along the U.S.-Mexico border and the mass deportation of millions of illegal immigrants.

"Is this a comic book version of a presidential campaign?" Harwood bluntly asked Trump.

Trump answered that wasn't a very nicely-asked question. He noted that CNBC host Larry Kudlow said he loves Trump's tax plan.

Trump also reiterated that he will indeed build a wall along the southern border and make Mexico pay for it.

"A politician cannot get them to pay," Trump stated. "I can."

After the dust settles, Fox News Channel will have a must-see three hours of live coverage to break down the night's winners and losers. It all starts at 10pm ET with Hannity, followed by The O'Reilly Factor at 11pm  and a midnight Kelly File.

Watch the clip above.

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