Sen. Bernie Sanders told his supporters that it would be “irresponsible” not to vote for Joe Biden, saying that the failure to do so would essentially re-elect President Trump for a second term.

“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 re-elected?” Sanders told the Associated Press in an interview Tuesday.

“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,'” added Sanders, who endorsed Biden on Monday.

Sanders, 78, did not lay out any specific plans to hold rallies for Biden but said he would be at least as active for the former vice president as he was for Democratic presidential candidate Hillary Clinton in 2016, noting he held dozens of events for her.

But he said because of the coronavirus pandemic, he’s “incarcerated in his home” and did not know when he could return to the campaign trail.

He said he will not spend money on advertising or campaigning in the remaining primary elections, but still urged his supporters to vote for him anyway so he could gather as many delegates as possible to gain leverage to help shape the Democratic Party platform.

The Vermont independent said he would continue to fight for his progressive agenda like “Medicare for all.”

“If people want to vote for me, we’d appreciate it,” Sanders said and predicted that “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.”

Sanders, who dropped out of the race last week, said he didn’t see a mathematical path to the nomination and that soldiering on would have only benefited Trump.

“What would be the sense of staying in, of spending a whole lot of money, of attacking the vice president, giving fodder for Trump — what’s the sense of doing that when you can’t win?” he asked.

“I will do everything I can to help elect Joe,” Sanders continued. “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.”