Are presidents required by the Constitution to concede?

One week after Election Day and days after Joe Biden was projected as the winner of the 2020 presidential election, President Trump has not conceded, challenging the results via recounts and legal action alleging foul play.

Legally, however, there is no requirement for a president to make such a concession. The post-election transition process begins once the General Services Administration (GSA) ascertains the winner of the election, and transition preparations already began well before the election.

The Presidential Transition Act of 2000, the Pre-Election Presidential Transition Act of 2010 and the Presidential Transition Enhancement Act of 2019 provide for much of the process, which essentially begins months before the election.