President Joe Biden has said only the “Lord Almighty” can convince him to quit his re-election, adding that nobody is more qualified to lead America than him.

“I mean if the Lord Almighty came down and said, ‘Joe, get outta the race’, I would get outta the race. The Lord Almighty’s not coming down. I mean, these hypotheticals,” Mr Biden told ABC News in an interview on Friday.

Mr Biden, 81, has been asked to step down by New York Times and some of his Democrat colleagues after his below-par performance during presidential debate last week. But he dismissed the calls, blaming his poor performance on jet lag.

“I have a cognitive test every single day,” Mr Biden said “I don’t think anybody’s more qualified to be president or win this race than me.”

Mr Biden’s lacklustre performance during last week’s debate has raised questions on whether he is fit to lead world’s biggest democracy.

Last week’s debate, in which Mr Biden fumbled, sounded incoherent, appeared lost and not able to articulate his thoughts, sparked discussion on his mental and cognitive acuity.

Though Mr Biden admitted he almost slept off on the stage while debating with former President Donald Trump, he insisted on staying in the race despite calls from his party men.

Hosted by CNN, the debate was a historic one for America as it was the first to feature a sitting president and a former president.

For the duo of Mr Biden and Mr Trump, it was a rematch, having debated back in the 2020 presidential election season.

CNN’s post debate poll showed 67 per cent chose Mr Trump as the winner, while 33 per cent voted Mr Biden winner of the debate.