Joe Biden will return to campaigning next week after self-isolating with Covid, his team has said.

The 81-year-old President had been forced into withdrawing from a speech at the last minute two days ago after testing positive for the illness.

White House spokesperson Karine Jean-Pierre said that despite the President being "vaccinated and boosted", he was suffering from "mild symptoms" - and had returned to home state Delaware to recover.

But now, campaign chair Jen O'Malley Dillon has confirmed that the Commander-in-Chief will hit the campaign trail once again this week.

She told US outlet MSNBC: "He is absolutely in it... While Biden takes concerns from some Democrats seriously, he is committed to fighting to win a second term."

The news follows a spike in speculation over just who the Democratic nominee could be for November's election showdown against Donald Trump.

Rumours started swirling on social media that Vice President Kamala Harris could be eyeing up an unlikely run for Democratic candidacy in the wake of the President's ill health - with exactly one month remaining until the Democratic National Convention (DNC) gets underway.

Harris had made a number of campaign-worthy posts on social media using "I", not "We", which raised eyebrows over just why the VP might be switching to singular pronouns.

Though Harris has been slammed as unpopular among the American public, Democratic delegates and activists have considered lending her support.

Nico Brancolini, a vice president of the Stonewall Democratic Club, said: "Kamala isn't the strongest overall - but logistically it'd be the cleanest... But imagine the fury if a sitting Vice President who is a black woman were passed over for any of the other candidates."