Ex-Democratic presidential candidate Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) endorsed former rival Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE during a virtual event Monday.

"We need you in the White House. I will do all that I can to see that that happens, Joe," Sanders told Biden during the former vice president's virtual event on the coronavirus.

"Today, I am asking all Americans — I'm asking every Democrat, I'm asking every independent, I'm asking a lot of Republicans — to come together in this campaign to support your candidacy, which I endorse," Sanders added.

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The endorsement, which comes less than a week after Sanders suspended his own White House bid, marks an attempt to unify the progressive and moderate wings of the Democratic Party. The move is also aimed at quelling concerns that the party won't be able to come together ahead of the general election in November.

Sanders did not endorse the 2016 Democratic nominee, Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE, until roughly two weeks before the party's convention in July.

JUST IN: Sen. Bernie Sanders is endorsing Joe Biden for president pic.twitter.com/U8cEsvLO1O — QuickTake by Bloomberg (@QuickTake) April 13, 2020

Sanders and his supporters, who regarded the senator's presidential campaign as a movement, have been skeptical of the party establishment, pointing to the reluctance of Democratic leaders to support progressive measures like "Medicare for All."

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Biden and more moderate Democrats, in turn, have instead focused on strengthening and expanding the 2010 Affordable Care Act, also known as ObamaCare.

Biden and Sanders acknowledged their policy differences at Monday's event while also highlighting their shared goal of defeating President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Election Day.

"I think that your endorsement means a great deal. It means a great deal to me. I think people are going to be surprised that we are apart on some issues but we're awfully close," Biden told Sanders. "I'm going to need you, not just to win the campaign, but to govern."

Updated at 3:01 p.m.