US President Donald Trump has told his team to co-operate on the transition for President-elect Joe Biden but has vowed to keep up the fight.
Mr Trump was defeated by Mr Biden in the US election earlier this month but has consistently refused to accept the result, claiming widespread voter fraud but failing to produce evidence.
On Monday, in a sign that he might be realising that he must leave the White House on 20 January, he said he had given Emily Murphy, the head of the General Services Administration (GSA), the go-ahead to proceed with a transition for Mr Biden's administration.
The GSA is responsible for many of the basic services that allow the US government to function, from buildings and transport management to IT, financial services, supply chains and human resources.
Mr Trump said in a tweet that his case against the election results "strongly continues", adding that he and supporters would "keep up the good fight".
But he added: "Nevertheless, in the best interest of our country, I am recommending that Emily and her team do what needs to be done with regard to initial protocols, and have told my team to do the same."
Federal law states the GSA administrator must issue a letter of "ascertainment" determining the likely winner of the race before the transition can formally begin.