US President Donald Trump appeared on Sunday to publicly acknowledge for the first time that his Democratic rival Joe Biden won the November 3rd presidential election.
"He won because the Election was Rigged," Mr Trump tweeted.
However, Mr Trump reiterated his false claims that the vote was rigged.
It comes as several thousand supporters of Mr Trump gathered in Washington to protest against the country’s election results on Saturday evening.
There were clashes with counter-protesters, with at least one stabbing and 20 arrests.
Several other US cities saw gatherings of Trump supporters unwilling to accept Democrat Joe Biden’s Electoral College and popular vote victory.
Cries of “stop the steal” and “count every vote” continued in spite of a lack of evidence of voter fraud or other problems that could reverse the result.
After night fell, the relatively peaceful demonstrations in Washington turned from tense to violent.
Videos posted on social media showed fistfights, projectiles and clubs as Trump supporters clashed with those demanding they take their banners and leave.
The tensions extended into Sunday morning. A variety of charges, including assault and weapons possession, were filed against those arrested, officials said. Two police officers were injured and several firearms were recovered.
Mr Trump himself had given an approving nod to the gathering on Saturday morning by dispatching his motorcade through streets lined with supporters before rolling on to his Virginia golf club.
