The governor of Guam Eddie Calvo says North Korea would be destroyed by the United States if it fires missiles at the US territory.
President Donald Trump made a similar threat in an address to the United Nations General Assembly this week in which he referred to the North Korean leader Kim Jong-un as "rocketman".
Last month, Pyongyang threatened to fire missiles towards Guam which is home to three US military bases.
Mr Calvo told Pacific Daily News he was glad President Trump was using strong language in response to the North Korean threat.
"Any attack on Guam, I want Kim Jong-un to know that would probably mena the destruction of North Korea," he said.
"I would hate to see so much destruction of life, but for someone as crazy as Kim Jong-un you've got to do it in as simple and as primal a sense as possible. And I don't know how it could more simpler than that."
Eddie Calvo's Guam is about 3400 kilometres from North Korea and within range of a missile it recently fired over Japan.