Charles Krauthammer said on "The Kelly File" that there's no doubt that Donald Trump has a very strong constituency, but the question is how far he can expand beyond that.

Krauthammer explained that the large number of Republican voters who have said they will never support Trump puts a ceiling on his campaign.

He said that much of Trump's success comes from his outspoken, flashy style, and Trump's mastery of free media explains the GOP front-runner's meteoric rise.

"His campaign is the greatest reality television show ever done," Krauthammer stated. "The question is: Will that win you an election? And will it make you a good president?"

Watch the "Kelly File" clip above and let us know your thoughts.

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