Donald TrumpDonald John TrumpMueller report findings could be a 'good day' for Trump, Dem senator says Trump officials heading to China for trade talks next week Showdown looms over Mueller report MORE on Monday said he was caught off guard by Newt Gingrich’s defense of a judge overseeing lawsuits against Trump University.

“I was surprised at Newt,” the presumptive GOP presidential nominee said on Fox News's "Fox and Friends." "I thought it was inappropriate what he said.”

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Gingrich last weekend criticized Trump’s comments about Judge Gonzalo Curiel's Hispanic heritage.

“I don’t know what Trump’s reasoning was, and I don’t care,”  the former Speaker said in a Saturday email to The Washington Post. 

“His description of the judge in terms of his parentage is completely unacceptable,” added Gingrich, who has previously endorsed  the real estate mogul and has been mentioned as a possible Trump running mate.

Gingrich on Sunday doubled down on his criticism of Trump, calling it “inexcusable” and “one of the worst mistakes” the billionaire has made.

Trump said last week Curiel is biased against the billionaire because of Trump's immigration policies.

“I’m building a wall,” he said of his proposed boundary along U.S. border with Mexico. "It’s an inherent conflict of interest.”

Curiel is of Hispanic heritage but was born in Indiana.