US lawmakers are set to meet on Wednesday to confirm Joe Biden’s victory in the presidential election amidst protests from Trump supporters.
A joint session of Congress will count and confirm electoral college votes.
Some Republicans have pledged to support President Donald Trump’s efforts to overturn the result by formally objecting at the session, in a bid that is almost certain to fail.
Hundreds of National Guard members are being mobilized.
Supporters of Trump have begun gathering in Washington DC to rally against the certification of his defeat, and counter-protests are expected.
He has refused to concede the November 3 election, repeatedly alleging fraud without providing any evidence.
Biden, a Democrat, is due to be inaugurated as president on 20 January.