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Donald Trump faced challenges at the Fox News GOP debate on Trump University, as he faces a class-action lawsuit from people who took the classes. 

Marco Rubio said Trump "said whatever he had to say" to get people to borrow money to go to a "fake university." 

Trump said the case could have been settled easily, but he refuses to do so because he believes he's on the right side.

He said the university has an A rating from the Better Business Bureau (BBB) and a 98% approval rating from people who took the courses. 

Rubio insisted that was false, while Megyn Kelly pointed out that the BBB rating was a D-minus in 2010.

Trump argued that it has since been elevated back to an A. 

Watch the back-and-forth above.

UPDATE: Trump tweeted out the following document after the debate. 

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