The dictator, Kim Jong-un has been in charge of North Korea since his dad died.
In this time has also poisoned his brother by hiring a group of people who executed his brother using Puffa Fish poison!
He has also threatened the USA several times and carried out loads of tests of missiles and his nuclear programme.
President Trump responded through twitter and in speeches. He told Kim Jong-un “Do not underestimate us. Do not try us”.