Every president since Ronald Reagan has left a note for his successor, and President Joe 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.

The tradition of the outgoing president leaving the incoming president a letter started with Ronald Reagan in 1989. Reagan left a note for his successor George H.W. Bush, who served as his vice president for eight years. President Trump left a note for Biden when Biden took office in 2021, but the contents of the letter have never been shared.