Trump has spent his days with few public events and pressed unsubstantiated allegations of fraud on social media Biden and Vice President-elect Kamala Harris have moved forward with their transition efforts WASHINGTON: President Donald Trump appeared to acknowledge publicly for the first time on Sunday that Democrat Joe Biden won the Nov. 3 US presidential election but asserted that it was "rigged", reiterating his false claims of widespread voting fraud. Biden defeated Trump by winning a series of battleground states that the Republican incumbent had won in 2016. The Democratic former vice president also won the national popular vote by more than 5.5 million votes, or 3.6 percentage points. Trump seemed to acknowledge Biden"s victory in a Twitter post in which he listed unsubstantiated allegations of fraud. "He won because the Election was Rigged," Trump wrote on Twitter on Sunday morning, not referring to Biden by name. "NO VOTE WATCHERS OR OBSERVERS allowed, vote tabulated by a Radical Left privately owned company, Dominion, with a bad reputation & bum equipment that couldn"t even qualify for Texas (which I won by a lot!), the Fake & Silent Media, & more!" He won because the Election was Rigged. NO VOTE WATCHERS OR OBSERVERS allowed, vote tabulated by a Radical Left privately owned company, Dominion, with a bad reputation & bum equipment that couldn’t even qualify for Texas (which I won by a lot!), the Fake & Silent Media, & more! https://t.co/Exb3C1mAPg — Donald J. Trump (@realDonaldTrump) November 15, 2020 Trump"s campaign has filed lawsuits seeking to overturn the results in multiple states, though without success, and legal experts say the litigation stands little chance of altering the outcome of the election. Election officials of both parties have said there is no evidence of major irregularities. Democrats and other critics have accused Trump of trying to delegitimize Biden"s victory and undermine public confidence in the American electoral process. Before the election, Trump had refused to commit to a peaceful transfer of power. Trump"s refusal to concede did not change the fact that Biden was the president-elect, but it has stalled the government"s normal process of preparing for a new presidential administration. The Trump administration"s decision not to recognize Biden as the winner has prevented Biden and his team from gaining access to government office space and to funding normally afforded to an incoming administration to ensure a smooth transition. The federal agency in charge of providing those resources, the General Services Administration, has yet to recognize Biden"s victory. Biden has spent days huddled with advisers as he weighs Cabinet appointments, fields congratulatory calls from world leaders and maps out the policies he will pursue after being sworn in on Jan. 20. He is expected to continue meeting with advisers in private on Sunday. Biden has won 306 votes in the state-by-state Electoral College system that determines the presidential winner, according to Edison Research, far more than the 270 needed to secure a majority. Trump earned the same number of electoral votes in 2016 over Democratic candidate Hillary Clinton, a victory he has called a "landslide" despite the fact that she won the national popular vote by about 3 million ballots.