Megyn Kelly challenged Donald Trump on some of his past derogatory comments about women.

She said Trump has called women he dislikes "fat pigs" and "slobs" in the past. 

"Only Rosie O'Donnell," Trump responded to laughter and applause. 

Kelly said that "for the record, it was well beyond Rosie O'Donnell," noting that once Trump told a contestant on "The Apprentice" that it "would be a pretty picture to see her on her knees." 

She asked Trump whether these statements could hurt him against a Democrat in the general election. 

Trump responded that the country is in big trouble and one of the biggest problems right now is political correctness. 

He said that much of what he says is "fun and kidding."

Watch the back-and-forth below.