U.S. President Donald Trump has responded to North Korean leader Kim Jong Un’s boast that he has a “nuclear button” on his desk by warning that the United States has a “bigger and more powerful” nuclear trigger.

“North Korean Leader Kim Jong Un just stated that the ‘Nuclear Button is on his desk at all times’,” Trump tweeted on January 2.

“Will someone from his depleted and food starved regime 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!”

Kim in his annual New Year’s address had warned he had what he called a “nuclear button” on his desk and weapons that he claimed can reach all of the United States, but he said he would only use the weapons if Pyongyang’s security was threatened.

“This is a reality, not a threat,” Kim said, while he also extended an invitation to South Korea to restart talks and said his country was interested in taking part in the Pyeongchang Games next month.