Tensions have been rising between North Korea and the U.S. ever since Donald Trump took office. Now, these tensions appear to have reached a boiling point after Arizona Senator John McCain called North Korean dictator Kim Jong Un a “crazy fat kid.”

“China is the only one that can control Kim Jong-un, this crazy fat kid that’s running North Korea. They could stop North Korea’s economy in a week,” McCain said, according to The Independent.

“We’re not dealing even with someone like Joseph Stalin, who had a certain rationality to his barbarity,” he added.

North Korea was reportedly furious about McCain’s comments, saying they “hurt the dignity” of the country.

“What they uttered to dare hurt the dignity of the supreme leadership of the DPRK is just a manifestation of their worst hostility toward the DPRK’s ideology and social system and its people and a grave provocation little short of declaration of war against it,” the country said in a statement. “The service personnel and people of the DPRK are regarding the dignity of their supreme leadership as their life and soul.”

“The US must know very well about how they react to any offensive acts against it. As such guys as John McCain and Ted Cruz made a provocation tantamount to declaration of war against the DPRK, the DPRK will take steps to counter it,” the statement continued. “They will have to bitterly experience the disastrous consequences to be entailed by their reckless tongue-lashing and then any regret for it will come too late. They will have to be entirely responsible for their foolhardy tongue-lashing.”

The statement concluded by saying that North Korea will “will fulfil its sacred mission” of “dealing a merciless sledge-hammer blow at those daring hurt the dignity of the supreme leadership.”

Despite this clear threat against the U.S., Trump is still not backing down. Instead, he has directed the U.S. military to continue their participation in joint exercises with South Korea’s military to prepare for the possibility of an attack.

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