Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE on Monday slammed Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE for her comments that half of the Republican presidential nominee's supporters could be categorized as a "basket of deplorables."

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"I think it's the single biggest mistake of the political season," Trump said Monday on "Fox & Friends."

Trump said that when he heard about his Democratic rival's comments, he didn't believe them.

"Personally, when I heard it, I thought that it was not something that was within the realm of possible that she would have said it," Trump said.

"And I said to my people, 'I don't believe she said it, I think you have to check it, because there's no way that she said this.' And she actually did and she even really doubled up. ... It was said with such anger."

Trump said a candidate can't leave behind such a large group of people.

"You're president of all the people. You're not president of 50 percent or 75 percent, you're president of all the people, you're president of everybody," Trump said.

"You have to be president of everybody."

The Democratic nominee on Saturday said she regretted saying half of Trump's supports could be categorized as a "basket of deplorables."