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Former House Speaker Newt Gingrich, a potential VP pick, had some tough words for Donald Trump on the presumptive nominee's criticism of the judge presiding over the Trump University lawsuit.

On Fox News Sunday, Gingrich said Trump made a big mistake by bringing up the fact that Judge Gonzalo Curiel, who was born in Indiana, is of Mexican descent.

"It was one of the worst mistakes Trump has made. Inexcusable," said Gingrich, who has been advising Trump in the campaign. 

"That judge is not a Mexican. He's an American. I hope it was sloppiness."

Trump sought to defend himself this morning on Fox and Friends, saying Gingrich's remarks were "inappropriate" and vowing that he would prevail in the class-action litigation.

"This case should have been thrown out on summary judgment. If someone else was in charge, this would have been thrown out on summary judgment. ... As far as Newt is concerned, I was surprised at Newt. I thought it was inappropriate what he said," Trump remarked.

He argued that "thousands and thousands" of people who took the courses will testify on his behalf in the case.

Trump then lashed out at the media for continually asking about the lawsuit rather than the problems facing the country and allegations concerning the Clintons. 

I respond to the very crooked and ... maybe criminally dishonest Clinton foundation, the horrible money they took in, and then he goes around or she goes around and makes speeches, and the favors that were done. Nobody really looks at that stuff. You're talking about big league stuff. The money that comes in and pours in from foreign countries and she's secretary of state. I talk about that, people don't pick that up. They pick up this. It's amazing.

Watch the interview above and hear more from Trump tonight at 8:00 ET on The O'Reilly Factor.

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