However, Trump has threatened legal challenges to prevent ballots from being counted after election day.

According to reports, more than 91 million Americans have already posted their votes, with some states receiving more early votes than their state’s entire 2016 tally.

Trump was reported to have reiterated his claims that postal ballots are not secure and that Democrats would try to steal the election.

Fears of tensions on election night and afterward were further stoked by a report that Trump could declare victory prematurely.

The Axios news site reported Sunday that Trump has told confidants he would declare victory Tuesday night if it looks like he’s ahead.

Trump called it a “false report” but repeated his argument that “I don’t think it’s fair that we have to wait for a long period of time after the election.”

He has repeatedly claimed, without evidence, that mail-in ballots are open to fraud, warning of “bedlam” if no clear winner emerges quickly.

“I think it’s a terrible thing when people or states are allowed to tabulate ballots for a long period of time after the election is over, because it can only lead to one thing,” Mr Trump said, criticising decisions by the Supreme Court to allow ballots to be received after election day in several battleground states. 

“As soon as the election is over – we’re going in with our lawyers,” he said, mentioning the state of Pennsylvania specifically.

Asked about the report, Biden was quoted as saying,  “The president is not going to steal this election.”