United States President Joe Biden has said there is nothing that would make him consider quitting the presidential race.

After a shaky performance at the presidential debate with former President and Republican candidate Donald Trump, on June 27, there have been calls for Biden to step aside.

Some US voters, political analysts and stakeholders have also expressed concerns over the president’s health and mental alertness after the debate.

Speaking in an interview with ABC News on Friday, Biden said only the “Lord Almighty” would convince him to drop his re-election bid.

He said, “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.

“I don’t think anybody is more qualified to be president or win this race than me.

“Look, I’m running again because I think I understand best what has to be done to take this nation to a completely new level. We are on our way. We are on our way.”

Biden also dismissed criticisms that he is too old and feeble to run for president for a second time, after the White House said he is not backing down from the race despite growing concerns.

“I see all these stories that say I am too old.. was I too old to create 15 million jobs? Was I too old to erase student debt for five million Americans? Do you think I’m too old to beat Donald Trump?” he asked.