US Congress has finally certified Joe Biden's presidential election victory on a day that saw a time-honoured ceremony become a nightmare of unprecedented political terror.
The House and Senate affirmed the Democrat 's electoral college win after a violent throng of pro- Trump rioters spent hours on Wednesday running rampant through the Capitol.
A woman was fatally shot, windows were smashed and the mob forced shaken legislators and aides to flee the building, shielded by police.
Donald Trump said there would be an "orderly transition" of power on January 20 when Biden is sworn in as the 46th president.
After Congress certified Biden's November win, Trump said in a statement tweeted by his social media director Dan Scavino: "Even though I totally disagree with the outcome of the election, and the facts bear me out, nevertheless there will be an orderly transition on January 20th.
"I have always said we would continue our fight to ensure that only legal votes were counted. While this represents the end of the greatest first term in presidential history, it's only the beginning of our fight to Make America Great Again."
The violence began shortly after Trump repeated his baseless claims of election fraud to thousands of rallying demonstrators he had invited to Washington.
Four people died after the violence erupted.
Many then surged to the Capitol after he incited them to go there as legislators debated the electoral votes.
More than six hours after the violence erupted, members resumed the session.
Thirteen Republican senators and dozens of party representatives had planned to force debate and votes on the ballots in up to six states.
The assault on the Capitol made some Republicans squeamish about trying to overturn Biden's win, and challenges were lodged only against Arizona and Pennsylvania. Both efforts lost overwhelmingly.
Biden defeated Trump by 306-232 electoral votes and will be inaugurated on January 20.
