Donald TrumpDonald John TrumpFive landmark moments of testimony to Congress Lindsey Graham basks in the impeachment spotlight Democrats sharpen their message on impeachment MORE on Monday called Hillary ClintonHillary Diane Rodham ClintonFive landmark moments of testimony to Congress Top diplomat said request for specific probes in Ukraine was 'contrary' to US policy Feehery: What Republicans must do to adapt to political realignment MORE “the devil” while describing the regret he thinks Sen. Bernie SandersBernie SandersTech firms face skepticism over California housing response Press: Another billionaire need not apply Ex-Massachusetts Gov. Deval Patrick mulling 2020 run: report MORE (I-Vt.) has over endorsing her.

“He made a bad deal,” he said of Sanders during a campaign rally in Harrisburg, Pa. "He should not have made the deal. Believe me, he has buyer’s remorse.

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“His people are angry at him, and they should be. If he would have not just done anything, gone home, go to sleep, relax, he would have been a hero. But he made a deal with the devil. She’s the devil.”

Trump said Clinton had slighted Sanders by picking a running mate who is antithetical to his progressive values.

“She picked a vice presidential candidate who is like the exact opposite of him,” he said of Sen. Tim KaineTimothy (Tim) Michael KaineProgressive freshmen jump into leadership PAC fundraising Lawmakers wager local booze, favorite foods in World Series bets José Andrés: Food served in the Capitol came from undocumented immigrants MORE (D-Va.).

“Tim Kaine, from Virginia, has one problem. The first thing he did as governor there is he raised taxes by $4 million dollars. He’s not even popular there, I don’t get it.”

Trump, the GOP’s presidential nominee, additionally criticized the media’s favoritism towards Clinton, his Democratic counterpart.

“The biggest problem is we have a very dishonest media,” he said. "These are among the most dishonest people you’ll ever, ever meet.

“I’ll tell you — they’re so biased towards crooked Hillary,” Trump added of CNN. "They call it CNN — ‘Clinton News Network.' We’re going to punch through the media. We have to.”

Sanders gave Clinton his blessing last week as the Democratic Party formally nominated her for the presidency.

“I move that Hillary Clinton be selected as the nominee of the Democratic Party for the presidency of the United States,” he said on July 26 at the Democratic National Convention in Philadelphia.

Clinton then made history two days later as the first woman to formally accept a presidential nomination from a major political party.