"We've got to make Trump a one-term president, and we need you in the White House", Sanders said.
"Today I am asking all Americans".
Sanders, a self-declared democratic socialist, was Biden's last challenger for the Democratic presidential nomination, but suspended his campaign last week in the face of Biden's seemingly insurmountable lead in pledged delegates to the party's national presidential nominating convention in August.
Even so, it remained unclear how soon Sanders, who is especially popular with liberal young voters, would rally behind Biden, whose support comes chiefly from the party's older moderates.
In the online event, Mr. Sanders called on Democrats, independents and Republicans "to come together in this campaign to support (Mr. Biden's) candidacy, which I endorse, to make certain that we defeat somebody who I believe.is the most unsafe president in the modern history of this country".
With social distancing in widespread effect, Biden has been forced to move the bulk of his campaign to online events and has watched as the global pandemic had relegated the United States presidential race to the back burner.
The former vice president, who's become increasingly critical of the Trump administration's response to the dual health and economic crises, also held "virtual fireside chats" last week with former Secretary of Defense Chuck Hagel.
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Evers said on Monday that the election was "a mess that could have been avoided". I mean, obviously, you could logically say that if you had a process that was ongoing and you started mitigation earlier, you could have saved lives.
Trump's campaign, meanwhile, seized on Sanders' endorsement to underscore Biden's embrace of some of his plans.
Biden and his campaign had been reaching out to Sanders and his aides for weeks before he dropped out. He also expressed confidence that Biden was an "inclusive" candidate who wants to "bring people in" to his campaign, including those he disagrees with.
That included conversation between a top Biden aide, Anita Dunn, and a counterpart with Sanders, Jeff Weaver. Neither could be reached for comment. Elizabeth Warren's policies. The day after Sanders exited the race, Biden came out in support of lowering the Medicare eligibility age from 65 to 60 while pledging to cancel student debt for many low- and middle-income borrowers.
While Sanders campaigned for Clinton dozens of times after the 2016 primary, the rapport on display with Biden on Monday was far lighter than anything voters saw four years ago. But each Biden and Sanders instructed supporters Monday they're ready to sign up for forces to take away Trump from place of work.
The deadly coronavirus pandemic has forced a suspension of all in-person political campaigning, as most of the nation remains under stay-at-home orders - including Biden and Sanders, who appeared online from their homes. "We are in the midst of an all-out war with a risky invisible enemy", a Trump campaign email sent to supporters last week said.
Still, Emmer said that members can "sit down and make fundraising calls and touch base with donors asking how they are and how they are handling this crisis", though he acknowledged that if the virus spread did not slow, "large gathering fundraisers, email solicitations and mail solicitations may need to be paused".