President Donald Trump praised the U.S. nuclear arsenal in a series of tweets on the morning of August 9, a day after threatening North Korea with “fire and fury.”

“My first order as President was to renovate and modernize our nuclear arsenal. It is now far stronger and more powerful than ever before,” Trump tweeted.

“Hopefully we will never have to use this power, but there will never be a time that we are not the most powerful nation in the world!” he added.

It was unclear what specific steps Trump has taken in his six-plus months in office.

The president addressed growing tensions between the U.S. and North Korea during a statement Tuesday from his private club in Bedminster, NJ.

“He has been very threatening beyond a normal state,” Trump said of Kim Jong Un, North Korea’s leader. “As I said, they will be met with fire, fury, and frankly power, the likes of which this world has never seen before.”

North Korea responded August 8 by threatening a missile strike on Guam.

Secretary of State Rex Tillerson urged calm on August 9, saying doesn’t believe there is “any imminent threat” from North Korea.

Tillerson said Trump was trying to send a strong and clear message to North Korea’s leader so that there wouldn’t be “any miscalculation.”

“What the president is doing is sending a strong message to North Korea in language that Kim Jong Un can understand, because he doesn’t seem to understand diplomatic language,” Tillerson said. “I think the president just wanted to be clear to the North Korean regime on the U.S. unquestionable ability to defend itself, will defend itself and its allies

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