Without evidence, Trump has repeatedly claimed increased mail voting would be rife with fraud, remarks that have deepened Democrats' fears that he will refuse to accept the election outcome should he lose.

"We're going to hold an election on November 3 and the president is going to win," White House Chief of Staff Mark Meadows said on CBS' "Face the Nation."

U.S. President Donald Trump is privately reassuring Republicans anxious about his deficits to Democrat Joe Biden, noting there are three months until Election Day.

A Republican National Convention spokeswoman said earlier on Saturday that the vote to renominate President Donald Trump would be conducted in private later this month.

As Joe Biden nears the announcement of his vice-presidential choice, the top contenders and their advocates are making final appeals.

Intelligence officials confirmed in recent days that foreign actors are actively seeking to compromise the private communications of “U.S. political campaigns, candidates and other political targets” while working to compromise the nation’s election infrastructure

A new poll from The Associated Press-NORC Center for Public Affairs Research also finds Trump’s approval for his handling of the COVID-19 pandemic falling to a new low, with just 32 per cent of Americans supportive of his approach.

Trump pushed back on the claim, which has been disputed by the fact that many early presidents owned slaves and some promoted segregation.

The Republican National Committee announced Thursday that it is sharply restricting attendance on three of the four nights of its convention in Jacksonville, Florida, next month.

After a venue change, spiking coronavirus cases and a sharp recession, Trump aides and allies are increasingly questioning whether it's worth the trouble, and some are advocating that the convention be scrapped altogether.