Charles Krauthammer told Megyn Kelly tonight that Fox News' Republican presidential primary debate will be all about Donald Trump.

Krauthammer said the two major questions are if Trump will act like a statesman and if any of his fellow GOP candidates will take him on.

Krauthammer said he's not sure if Trump could play the part of a statesman, and, furthermore, that might not even help him, since he has had such incredible success with his bluster.

As for if anyone will challenge Trump, Krauthammer said that if anyone were to do so, it would most likely be a candidate who isn't polling as well, such as Rick Perry.

"If he does the zinger that everybody replays, that could be his moment," Krauthammer said. "But it's dangerous for any candidate to go after Trump in that sense, because he zings back."

Get more insight from Krauthammer in the "Kelly File" clip above.

Don't miss the Fox News-Facebook Republican debate, Thursday Aug. 6, live from Cleveland at 9p ET, moderated by Megyn Kelly, Bret Baier and Chris Wallace.

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