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.

Trump left Biden a letter when his first term ended in 2020, despite skipping the inauguration. Biden never revealed the contents of the letter, but just said it was "very generous."

Ronald Reagan probably didn't realize he was starting a tradition when he wrote a note congratulating his successor and left it in the Oval Office desk drawer after two terms as president.He did that for George H.