WASHINGTON -U.S. President Joe Biden vowed to stay in the 2024 presidential race during a call with campaign staff on Wednesday and sought to reassure top Democrats on Capitol Hill that he is fit for re-election, despite his disastrous debate performance last week.

Biden dialed in to a call with worried members of his campaign team and told them he wasn't going anywhere, according to two sources familiar with the call.

"I am running," Biden said, adding he remained the Democratic Party leader and wasn't being pushed out, one source said.

The president will meet with Democratic governors on Wednesday at 6:30 p.m. ET (2230 GMT) to reassure them he is up to the job of standard-bearer for the party after the shaky debate with Republican Donald Trump. Some governors will attend virtually.

Asked Wednesday if Biden was considering stepping down, White House Press Secretary Karine Jean-Pierre said: "Absolutely not."

Biden spoke to Representative Hakeem Jeffries, the minority leader in the House of Representatives, on Tuesday, and Senator Chuck Schumer, the majority leader in the Senate, on Wednesday, a White House official said. He also spoke with House Democrat Jim Clyburn on Wednesday, whose office said afterward they had a long, private conversation.

Clyburn - a kingmaker of sorts within the Democratic Party and who was instrumental in Biden's 2020 win - told CNN on Wednesday that the party should hold a "mini-primary" if Biden steps aside, the first senior party member to talk publicly about how, exactly, replacing Biden as a candidate would work.

Clyburn, who said on Tuesday that he would back Vice President Kamala Harris as the presidential candidate if Biden were to depart, added: "If she were to be the nominee, we need to have a running mate and a strong running mate. And so all of this would give us an opportunity, not just to measure up who would be good to be at the top of the ticket, but also who would be best in second place."

Biden's halting, shaky debate performance against Trump in Atlanta last week sparked calls for him to step aside as the Democratic presidential candidate for the Nov. 5 election. Trump repeated a well-worn slate of falsehoods, including that he won the 2020 election.

Democrats raised fresh concerns about Biden on Tuesday, with one House member calling for him to drop out and former Speaker Nancy Pelosi, a longtime Biden ally, saying it was legitimate to ask whether Biden's performance in Atlanta was an "episode" or a condition.

COULD A GOVERNOR REPLACE BIDEN?

The president has said he was tired after two foreign trips and the White House has said he had a cold. His campaign has held damage control calls with donors, and Biden has shown no signs so far abandoning his quest for a second term.

White House chief of staff Jeff Zients held a call with demoralized White House staff on Wednesday as well, acknowledging that it had been a challenging few days while stressing that the Biden team had a record to be proud of and more work to do.

A handful of governors are potential rivals to Biden if pressure for him to step aside were to increase, but many of them also speak on Biden's behalf on the campaign trail.

Harris is the likely successor if Biden does step aside, multiple sources told Reuters. However Michigan Governor Gretchen Whitmer, California Governor Gavin Newsom, Illinois Governor J.B. Pritzker, Pennsylvania Governor Josh Shapiro and Kentucky Governor Andy Beshear have all been mentioned as possible replacements to Biden if he decided to bow out as the 2024 candidate.

  - Reuters