Barrett's confirmation on Monday was hardly in doubt, with majority Republicans mostly united in support behind U.S. President Donald Trump's pick.

'I think there's every prospect he'll engage in it,' said John Bolton of Donald Trump stirring up chaos if there is a delay in determining who wins the election.

Trump at his rallies repeatedly criticized the news media for focusing on the virus, which has killed about 224,000 people in the United States and more than 1 million across the globe.

Biden has long played up his blue-collar roots in Scranton, Pa., even when he was a senator in neighbouring Delaware.

Trump has checked off some items on his to-do list, but has also fallen short on many as he asks voters for a second term in the White House.

There are an estimated 620,000 eligible American voters in Canada, but in 2016, only five per cent, or about 33,000, actually voted.

More than 52 million votes have already been cast, with an additional 100 million or so expected before a winner is declared.

Miller also forecast a broader offensive against so-called ``sanctuary'' jurisdictions that limit co-operation with federal immigration authorities.

Early voting is immensely popular in Pennsylvania. It's also sparked a lot of partisan handwringing.

Michael McDonald, a professor who administers the U.S. Elections Project, predicts a record turnout of about 150 million or 65 per cent of eligible voters.