Sen. 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 (I-Vt.) said it would be “irresponsible” for his supporters to not back Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE’s presidential campaign, warning that refusing to get behind the former vice president could get President Trump Donald 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 reelected.

“Do we be as active as we can in electing Joe Biden and doing everything we can to move Joe and his campaign in a more progressive direction? Or do we choose to sit it out and allow the most dangerous president in modern American history to get reelected?” Sanders asked in an interview with The Associated Press.

“I believe that it’s irresponsible for anybody to say, ‘Well, I disagree with Joe Biden -- I disagree with Joe Biden! -- and therefore I’m not going to be involved.’”

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The remarks come a day after Sanders, who suspended his White House bid last week, endorsed Biden’s campaign.

Monday’s endorsement put to rest months of Democratic handwringing that Sanders would withhold his support for Biden over policy disagreements between the progressive senator and more centrist former vice president. Sanders’s endorsement, made just five days after he dropped out, came much faster than it did for Hillary Clinton Hillary 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 in 2016, when Sanders waited over a month to back the former secretary of state.

While Sanders told the AP he will no longer actively campaign or spend money on advertising for upcoming primary races, he will remain on the ballot to garner delegates that can influence the party platform at the summer’s convention and will continue advocating for policies such as “Medicare for All.”

“If people want to vote for me, we’d appreciate it,” Sanders said. “I think you’re going to see significant movement on the part of the Biden campaign into a more progressive direction on a whole lot of issues.”

Biden has indicated that he intends to try to win over progressives to his campaign, releasing plans to broaden Medicare and alleviate some student debt.

While some liberals have indicated they do not intend to vote for Biden unless he embraces more progressive policies he has already come out against, Sanders encouraged voters to look past policy disagreements.

“I will do everything I can to help elect Joe,” Sanders said. “We had a contentious campaign. We disagree on issues. But my job now is to not only rally my supporters, but to do everything I can to bring the party together to see that (Trump) is not elected president.”