The "Tonight Show" host's tongue-in-cheek excuse for the creepy letter is a burn to remember.

The "Late Night" host had a simple suggestion for the president for the next time he wants to celebrate a birthday.

The late night host isn't buying the president's explanation for this one.

The "Tonight Show" host was on his game in cracking wise over Trump's presence at the tennis final.

Michael Kosta reacted to the "strangely cryptic" letter with not-so-subtle words of encouragement.

The "Tonight Show" host's tongue-in-cheek excuse for the creepy letter is a burn to remember.

"The Tonight Show" host has been on a roll in dogging the president on the files.