Multiple Senate Democrats spoke candidly with ABC News about concerns they have about Biden's viability and said they want to continue discussions about the best path forward.

Connecticut Sen. Richard Blumenthal said he is worried about "an existential threat to the country if Donald Trump wins," and added "every day is critical" as Biden weighs his path forward.

"I have confidence in Joe Biden doing what's right for America. What he believes is right for America is to defeat Donald Trump and he'll be a pretty good judge of whether that will be possible," Blumenthal said. "We can all advise him we can raise concerns ultimately the decision is his and I am going to continue to raise concerns but I do think we need to ultimately unify because the existential threat here is Donald Trump.

Sen. Sheldon Whitehouse, a Rhode Island Democrat, associated himself with the comments of former Speaker Nancy Pelosi made on MSNBC Wednesday, in which she appeared to leave the door open for the president to step aside.

"I thought Speaker Pelosi nailed it pretty well this morning," Whitehouse told ABC News. He repeatedly avoided answering additional questions about whether Biden should resign before reiterating his support for Pelosi's comments.

Although Sen. Dick Durbin told ABC News Durbin he was "very concerned" about Biden's chances, he added that he's always known the race would be close.

"I believe we wage the right campaign and make a point of what we've achieved under this president we will see him reelected," Durbin said.

Ohio Sen. Sherrod Brown, who expressed worries about Biden's future during a closed-door meeting among Senate Democrats Tuesday, told ABC News he was hearing legitimate concerns from voters.

"My job is to listen to them my job is to go to hearings like this to fight for lower drug prices to fight for Ohio workers," Brown said.

-ABC News' Allison Pecorin and Rachel Scott

New York Rep. Pat Ryan, a moderate Democrat, is now calling on Biden to step aside as the Democratic nominee.

"Trump is an existential threat to American democracy; it is our duty to put forward the strongest candidate against him," Ryan wrote on X. "Joe Biden is a patriot but is no longer the best candidate to defeat Trump. For the good of our country, I am asking Joe Biden to step aside -- to deliver on his promise to be a bridge to a new generation of leaders.”

Ryan is the eighth House Democrat to publicly call on Biden to step aside.

-ABC News' Lauren Peller

Despite her remarks, Biden suggested he still has Pelosi’s support to continue his reelection campaign.

“Is Nancy Pelosi still behind you?” Biden was asked after taking a family photo with NATO leaders.

The president didn’t say anything, but flexed his arm and fist in the air.

-ABC News' Justin Gomez

After a day of closed-door Democratic meetings where lawmakers appeared to be absorbing the sober reality that Biden would stay as the party's presumptive nominee, new comments on Wednesday stirred fresh debate on Biden's viability and path forward.

First, former House Speaker Nancy Pelosi was noncommittal on whether she wanted Biden to continue to run despite Biden insisting repeatedly that he had decided to stay in the race.

"It's up to the president to decide if he is going to run," Pelosi said on MSNBC. "We're all encouraging him to make that decision because time is running short."

Then, George Clooney, in a stinging New York Times op-ed, said Biden should step aside.

"It's devastating to say it, but the Joe Biden I was with three weeks ago at the fund-raiser was not the Joe 'big F-ing deal' Biden of 2010," Clooney wrote. "He wasn't even the Joe Biden of 2020. He was the same man we all witnessed at the debate."