North Korea is threatening nuclear strikes on the U.S. after President Trump on Tuesday ratcheted up his rhetoric against Pyongyang.

State-run media warned that North Korea would "turn the U.S. mainland into the theater of a nuclear war" if it got signs of a possible American attack, according to CNN.

Trump on Tuesday warned North Korea not to make "any more threats" against the U.S.

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"He has been very threatening beyond a normal state, and as I said they will be met with fire, fury and frankly power, the likes of which this world has never seen before,” Trump said at his golf club in Bedminster, N.J., referring to North Korean leader Kim Jong Un.

Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE on Wednesday, however, said he doesn't believe there is "any imminent threat" from North Korea and urged Americans to remain calm.

“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.”