Former President Joe Biden has continued a tradition started by President Ronald Reagan, who left behind a letter in the White House for his successor, George H.W. Bush.

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.

Donald Trump has revealed what Joe Biden wrote to him in his "inspirational" farewell letter. Trump found the letter in his desk on Monday, as he signed executive orders in the Oval Office. It is part of a tradition, started by President Ronald Reagan, which sees one president leave a welcome note to his successor.