WATCH: President Trump Says North Korea’s Threats Will Be Met With ‘Fire & Fury’

President Donald Trump said Tuesday that if North Korea continues to escalate its nuclear missile threats against the United States, “they will be met with fire, fury and frankly power the likes of which this world has never seen before.”

Trump warned North Korean dictator Kim Jong Un in the comments made in Bedminster, New Jersey, before giving a briefing on the opioid crisis.

“North Korea best not make anymore threats to the United States. They will be met be met by fire and fury, like the world has never seen,” Trump said, sitting with his arms crossed and speaking to reporters. “He has been very threatening, beyond a normal statement. And as I said, they will be met by fire, fury and frankly power the likes of which this world has never seen before. Thank you.”

Trump’s statements came after the Washington Post reported that North Korea successfully produced a miniaturized nuclear warhead that can fit inside its missiles, according to U.S. intelligence officials. The Post reports that the production of the warhead takes North Korea across “a key threshold on the path to becoming a full-fledged nuclear power.”

According to CNN, the capability to use the miniaturized nuclear warhead has not been tested. A U.S. official told CNN that Kim Jong Un’s boasts about the program have to be taken seriously, saying “we have to take him at his word and we need to be prepared to deal with it.”

CNN has reported that North Korea could have the capacity to deliver a nuclear weapon to the U.S. mainland by early 2018. The news network reports that the country’s missile program showed significant progress during two July missile tests.

Earlier Tuesday, Trump praised the UN Security Council’s unanimous vote to pass sanctions on North Korea.

“After many years of failure,countries are coming together to finally address the dangers posed by North Korea. We must be tough & decisive!” Trump wrote in a tweet. On Monday, he tweeted, “The Fake News Media will not talk about the importance of the United Nations Security Council’s 15-0 vote in favor of sanctions on N. Korea!”

Trump also retweeted Tuesday a Fox News report that U.S. spy agencies detected North Korea moving anti-ship cruise missiles to a patrol boat. “North Korea is not showing any evidence it plans to halt its missile tests,” an unnamed official told Fox News. “It’s a trend that does not bode well for hopes of de-escalating tensions on the [Korean] peninsula.”

Meanwhile, US Ambassador to the UN Nikki Haley told “Fox and Friends” indicated the information in the Fox News report was classified and was leaked. “I can’t talk about anything that’s classified and if that’s in the newspaper that’s a shame,” she said on the Fox morning show.