Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on Thursday released an Instagram video that slams Bernie Sanders Bernie 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 as a quitter who gave up on his political movement.

The video uses footage from the campaign to suggest Sanders can't handle high-pressure situations but Trump can. It comes as Trump seeks to win over supporters of Sanders, who tend to be liberal but many of whom are not fans of Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE.

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Trump captioned the Instagram post: "Bernie caved!"

"I say these words to you tonight," Trump said in footage from the video taken from last week's Republican National Convention in Cleveland.

"I am with you, I will fight for you, and I will win for you."

In mocking Sanders, the video says that "being president, you need to handle pressure."

It then shows a clip of the Vermont senator's speech to an audience at an event on the margins of the Democratic National Convention this week, during which he said the country needs to elect Clinton and Sen. Tim Kaine Timothy (Tim) Michael KaineNames to watch as Trump picks Ginsburg replacement on Supreme Court Barrett seen as a front-runner for Trump Supreme Court pick Biden promises Democratic senators help in battleground states MORE (D-Va.), her running mate, to the White House. Sanders was booed when he mentioned Clinton's name.

"Some candidates cannot handle the pressure," the video then states.

The video also includes a clip from August of a Sanders rally where protesters with the Black Lives Matter movement stormed the stage and took the microphone from Sanders.

Trump has repeatedly criticized Sanders, calling the Vermont senator "exhausted" and saying he just wants to "go home to bed." He has said that Sanders "sold out" to Clinton, calling the time and effort he put into his campaign a waste.