PHILADELPHIA — Negotiations are underway to have 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 officially nominate 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 for president at the Democratic National Convention on Tuesday night, a move that would further signal party unity.

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According to a source familiar with the talks, the Vermont senator would nominate the presumptive Democratic nominee after the roll call vote that will be held on the convention floor.

NBC News first reported the negotiations.

Sanders delivered a speech Monday night that thanked his loyal supporters and called on them to rally behind Clinton as she faces GOP 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 in the fall.

Clinton will officially accept the Democratic presidential nomination in a prime-time speech Thursday night.

— Lisa Hagen contributed to this breaking news report, which was updated at 11:16 a.m.