- Video report by ITV News Washington Correspondent Robert Moore
Donald Trump threatened nuclear war with North Korea on Wednesday via a tweet. The president warned Kim Jong-un that his "nuclear button" is "much bigger and more powerful."
The post was a response to Mr Kim's declaration earlier this week that he has a button for nuclear weapons on his desk and the entire US mainland is within range.
Trump asked if someone from Mr Kim's "depleted and food starved regime" can "please inform him that I too have a Nuclear Button, but it is a much bigger & more powerful one than his, and my Button works!"
The President does not actually have a nuclear button on his desk.
Known as the nuclear "football", it is carried by a rotating group of military officers everywhere the President goes.
On Tuesday, US ambassador to the United Nations, Nikki Haley, warned North Korea against further missile tests.
"I hope that doesn't happen. But if it does, we must bring even tougher measures to bear against the North Korean regime," she said.
Earlier Mr Trump tweeted a threat to withdraw aid payments to Palestine.