Donald Trump has said he will leave the White House if Joe Biden is formally confirmed as the next US president.
Answering reporters’ questions for the first time since losing the 3 November vote, Mr Trump insisted, however, that “this race is far from over”.
He has refused to concede, citing unsubstantiated claims of voter fraud.
Individual states are currently certifying their results, after Mr Biden was projected as the winner with an unassailable lead.
The Democrat leads Mr Trump 306 votes to 232 under the electoral college system that is used to pick US presidents.
The tally is far more than the 270 needed to win, and Mr Biden also leads the popular vote by more than six million.
Electors will meet to formalise the result on 14 December, with Mr Biden due to be sworn in as president on 20 January.
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The president and his supporters have lodged a number of legal challenges over the election, but most have been dismissed.
Earlier this week, Mr Trump finally agreed to allow the formal transition to President-elect Biden’s team to begin, following several weeks of uncertainty.
The decision means Mr Biden is able to receive top security briefings and access key government officials and millions of dollars in funds as he prepares to take over.