President Donald Trump and North Korean Dictator Kim Jong Un’s war of words isn’t cooling down.

In a news conference Tuesday, Trump told reporters that a military option is on the table and that if the United States decided to go through with it, “it will be devastating” for North Korea.

The president’s comments echoed statements he made at the U.N. General Assembly last week, where he vowed to “totally destroy” the rogue nation if it continued to threaten the U.S. and its allies. Responding to Trump after his address, the North Korean leader called Trump a “dotard.” Trump fired back calling Kim Jong Un a “madman,” who “will be tested like never before.”

Katharine Moon, a political science professor at Wellesley College and non-resident senior fellow at The Brookings Institute; Carol Saivetz, senior advisor at MIT’s Security Studies Program; and Jim Walsh, a senior research associate at MIT’s Security Studies program and one of the few Americans who has traveled to North Korea for nuclear discussions, joined Jim Braude to discuss how dangerous this game of nuclear chicken has gotten.