Biden concedes he is 'not sure' he would be seeking reelection if it wasn't for Trump

President Joe Biden admitted he may not have sought reelection if former President Donald Trump did not announce his own campaign for a second term.

"If Trump wasn't running, I'm not sure I'd be running, but we cannot let him win," Biden told donors on Tuesday in Boston.

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Pressed on the remarks later Tuesday when he arrived back in Washington, D.C., Biden said Trump launching a White House comeback solidified his 2024 re-election campaign.

"I expect so," Biden said on if he'd run without Trump, "but look, he is running, and I have to run."

Biden said he won't end his campaign even if Trump, who is facing 91 felony indictments, is forced to drop out.

"No, not now," Biden told reporters.

Biden made the comments as his campaign has picked up its pace before the end of the financial year, and the president has spent the day in the Boston area for three fundraisers, including a concert with musician James Taylor.

Earlier, the White House defended Biden being on the campaign trail as Congress contends with Ukraine funding and immigration reform, in addition to the prospect of a presidential impeachment inquiry vote.

"The president is president wherever he is," spokeswoman Olivia Dalton said. "Some of you might have been with him over Thanksgiving when you ended up having three press conferences over the holiday weekend on the news breaking on hostage deals, the calls to heads of state."

Biden, 81, has repeatedly portrayed the 2024 election as a stark choice between himself and the Republican primary front-runner, Trump, but has not so explicitly cast doubt on his own decision-making process as the country's oldest president.

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"Folks, the idea that he is going to be able to do what he wants to do — you know, I feel it in my bones, what I suspect you feel as well — this next election is going to be different," the president told donors last week in Denver. "Not because I'm running — because of the nature of what's at stake."

"Our democracy is at stake," he said. "It literally is at stake because the same man who proclaims himself to be a proud election denier, the same man who is promising pardons for the Jan. 6 insurrectionists, the same man who said, and I quote, he wants to terminate — quote, 'termination of all rules, regulations, articles, and even [those] found in the Constitution,' end of quote. He means it."