Sen. Joe Manchin, I-W.Va., who caucuses with Democrats but left the party earlier this year, told "This Week" co-anchor Martha Raddatz on Sunday that he came to the decision "with a heavy heart," but that the swell of Democrats issuing similar calls after last month's debate made the current situation untenable for President Biden.

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‘The time has come’ for Joe Biden to ‘pass the torch’: Joe Manchin

ABC News’ Martha Raddatz interviews Sen. Joe Manchin, I-W.Va., on “This Week.”

Manchin argued that dropping out now would allow Biden to tackle a litany of issues he's prioritized, including uniting the country, ending fighting in Gaza and helping Ukraine fend off Russia's invasion, on top of being "able to show the rest of the world the orderly transfer of power from the superpower of the world."

"He will go down with a legacy unlike many people, as one of the finest and truly a [patriotic] American," Manchin said. "So, with that, I come with a heavy heart to think the time has come for him to pass the torch to a new generation."

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-ABC News' Tal Axelrod

Former President Bill Clinton and former Secretary of State Hilary Clinton are privately supporting Biden and have been encouraging donors to continue giving and stick with the president, two sources familiar with the matter told ABC News.

One source described the Clintons’ support as "encouraging," "supportive" and "deferential" to Biden’s decision to stay in this race.

Several members of Biden's senior staff including, deputy chief-of staff Annie Tomasini and Steve Richetti, the president's counselor, are in Rehoboth, Delaware where he is recovering from COVID-19.

As they have been since the debate, Richetti and Biden’s senior staff continue to “listen” and “hear out” concerns from donors, lawmakers and party leaders, but "not agreeing" with their views, according to the source.

Their message to those skeptics is that the president has a “hardened perspective” and is committed to this race. The source added that they’re telling skeptics the president is eager to make the contrast with Trump and get back out on the campaign trail.

-ABC News' Selina Wang and Justin Gomez

Rep. Mark Takano of California publicly called on Biden to "pass the torch" to Harris and drop out of the race in a statement posted on his X page

"Joe, I love you and respect you. But the stakes are too high to fail," he said.

"She has been an invaluable governing partner to the President and can run on their many shared achievements on behalf of the American people," Takano said of the vice president.

-ABC News' Lauren Peller

Sen. Sherrod Brown of Ohio became the fourth Senate Democrat to call on Biden to end his campaign Friday.

Brown said in a statement many of his constituents have reached out to him about the important matters in this year's election.

"I agree with the many Ohioans who have reached out to me. At this critical time, our full attention must return to these important issues. I think the President should end his campaign," he said.

-ABC News' Allison Pecorin and Isabella Murray