Every president since Ronald Reagan has left a note for his successor, and President Biden could be the first to write a letter to someone who is both his successor and the predecessor who left a note for him.

President Trump found a handwritten letter from outgoing President Biden in the Oval Office’s Resolute Desk, continuing a longstanding tradition of presidential transitions.

President Joe Biden will leave a letter for President-elect Donald Trump before leaving the Oval Office for the final time on Monday as part of tradition among outgoing presidents, according to a report.