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Trump's doubling down comes after GSA Chief Emily Murphy sent Biden a letter on Monday night, writing that the transition process could formally begin.
Murphy released a letter to Biden announcing the move, but dedicated a considerable portion to defending her own reputation and claiming she had been threatened and harassed.
Her letter, notably, does not go so far as 'ascertain' that Joe Biden is the winner of the election, despite networks calling the race 16 days ago, numerous states certifying their tallies, and Biden winning 306 electoral votes to Trump's 232. She also called him 'Mr.' instead of president-elect or vice president.
It came just over an hour after Michigan certified that Biden had won the state, putting another nail in the coffin of Trump's bid to overturn the election result.
The move ends much of the controversy over Trump's refusal to concede and means that a concession would be purely symbolic.
It allows Biden to get the same intelligence briefing as Trump, order FBI background checks on his picks for office and talk to senior officials in key roles - most notably, Dr. Tony Fauci.
The Biden-Harris transition team last night welcomed Murphy's letter, saying it was a 'needed step to begin tackling the challenges facing our nation'.
'In the days ahead, transition officials will begin meeting with federal officials to discuss the pandemic response' as well as national security issues, said Biden aide Yohannes Abraham.
But Trump tweeted later on Monday saying he had ordered Murphy to start the transition 'for the sake of the country' and claimed he was sure he would win 'the good fight.'