No nominee to the Supreme Court has ever been confirmed by the Senate this close to a presidential election, with more than 58 million ballots already cast ahead of Election Day on November 3.

The rush to confirm Barrett, 48, has bitterly divided Democrats and Republicans, who are expected to split along party lines on the final vote on Monday.

Trump has said repeatedly he wants her in place to vote on any election-related cases that go to the court.

With Republicans controlling the chamber 53-47 and no indication of an internal revolt against the conservative appeals court judge succeeding liberal Justice Ruth Bader Ginsburg, Barrett looks almost certain to take up a lifetime appointment on the bench over universal Democratic opposition.

Several Republicans who previously expressed concerns about rushing the process, including Alaska Republican Lisa Murkowski, are expected to approve Barrett's nomination.

Senate Democrats and some Republicans expressed unease at the possibility that Vice-President Mike Pence, several of whose close aides have tested positive for COVID-19, might attend Monday's vote.

Senate Minority Leader Chuck Schumer said Pence "reportedly intends to come" to the chamber to preside over the final vote and blasted him for being willing to put "the health of everyone who works in this building at risk".

With Barrett confirmed, the Supreme Court will have a solid 6-3 conservative majority.

Australian Associated Press