Joe Biden is "absolutely not" pulling out of the White House race, his spokeswoman said Wednesday, as pressure mounted on the president following his disastrous debate performance against Donald Trump, AFP reports.

Panic has gripped Democrats in the wake of last week's TV debate, and internal rumblings about finding a replacement candidate before November's election have been amplified by polls showing Trump extending his lead.

White House spokeswoman Karine Jean-Pierre rejected those reports outright, insisting Biden has no intention of withdrawing.

"The president is clear-eyed and he is staying in the race," she told reporters.

In a call with campaign and party staffers, Biden insisted he was going nowhere.

"I'm in this race to the end and we're going to win because when Democrats unite, we will always win. Just as we beat Donald Trump in 2020, we're going to beat him again in 2024," he said, according to a source close to the campaign.

He repeated that message in an emergency meeting at the White House with Democratic governors, who pledged their continued support, attendees said afterward.

"As the president continued to tell us, and show us, that he was all in... we said that we would stand with him," Maryland Governor Wes Moore, seen as a rising star and potential future presidential candidate, told reporters alongside Minnesota's Tim Walz and Kathy Hochul of New York.

Walz said Biden was "fit to serve."

Michigan Governor Gretchen Whitmer, who also attended the meeting and is seen as one of the top picks to replace Biden if he should drop out, said on X that he "is our nominee."

"He is in it to win it and I support him," she added.

Biden has repeatedly admitted he performed poorly in the debate, and was blunt in a radio interview recorded Wednesday with Wisconsin's Civic Media.

"I screwed up. I made a mistake. That's 90 minutes on stage. Look at what I've done in 3.5 years," he said.

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