US President Donald Trump’s spokeswoman has vowed the legal battle to contest Joe Biden’s White House election victory is only just beginning.
White House press secretary Kayleigh McEnany said the election is not over.
She made a flurry of allegations of election corruption, although no evidence of systemic fraud that might have influenced the result has emerged.
Mr Trump, a Republican, has not conceded the race.
Since media projected on Saturday that Mr Biden had won the critical state of Pennsylvania, accumulating enough votes to claim the White House, the president-elect has forged ahead with his plans to take reins of the power.
Mr Trump took to Twitter again on Monday to dispute the outcome, making unsubstantiated claims of “unthinkable and illegal” activity in the vote.
The General Services Administration, which manages federal agencies, has held off on allowing Biden aides to formally begin the transition, saying no “ascertainment” on an election winner had yet been made.
White House reporters have been saying that despite his objections, Mr Trump is expected to leave office begrudgingly in January and is already talking about running for the White House again in 2024.