Donald TrumpDonald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Monday called Hillary ClintonHillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE “the devil” while describing the regret he thinks Sen. Bernie SandersBernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' 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 KaineBarrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states Second GOP senator to quarantine after exposure to coronavirus 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.