US Vice-President Mike Pence has welcomed an effort by a group of senators to refuse to certify Joe Biden's presidential election win.
The 11 Republican senators and senators-elect, led by Ted Cruz, want a 10-day delay to audit unsubstantiated allegations of election fraud, reports the BBC.
The move is certain to fail as most senators are expected to endorse Biden in the 6 January vote.
Biden, a Democrat, is due to be inaugurated as president on 20 January.
President Donald Trump has refused to concede the 3 November election, repeatedly alleging fraud without providing any evidence.
Mike Pence has stopped short of echoing allegations of election fraud. But on Saturday, his chief of staff Marc Short said Mr Pence shared what he called "the concerns of millions of Americans about voter fraud and irregularities".
Pence "welcomes the efforts of members of the House and Senate to use the authority they have under the law to raise objections and bring forward evidence before the Congress and the American people", Short said.
As president of the Senate, Pence will have the responsibility of overseeing the session on 6 January and declaring Mr Biden the winner.