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.

Before he leaves office for the final time, President Joe Biden plans to pen President-elect Donald Trump a letter, CNN is told.

The new president was prompted to search for the letter as he casually took questions from reporters in the Oval Office.

This will mark the first time that a president who has received a letter from an outgoing president may well be writing a letter to the same person who's the incoming president'