President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Tuesday said “you always have to be concerned” about nuclear war when dealing with North Korea.

“Look, you always have to be concerned,” he told CNN’s Wisconsin affiliate, WTMJ. “You don’t know exactly who you’re dealing with."

“Now I’m put in a position where he actually has nuclear, and we’re going to have to do something about it,” Trump added. “It’s a very, very tricky situation. Hopefully he wants peace and we want peace and that’s going to be the end determination, but we’re going to see what happens.”

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Reports emerged Tuesday that the U.S. is considering shooting down future North Korean missile tests as a show of strength against Pyongyang.

Defense Secretary James Mattis has reportedly presented that option to Congress, but the military has not yet decided to implement the policy.

A senior North Korean official said Monday that the U.S. has created “a dangerous situation in which a thermonuclear war may break out at any minute.”

“[North Korea] is ready to react to any mode of war desired by the U.S.,” Kim In Ryong, North Korea’s deputy ambassador to the United Nations, said in Panmunjom, North Korea.

North Korea attempted but failed to launch a ballistic missile on its east coast last Sunday, the latest sign of rising tensions in Asia.

A U.S. official said the projectile “blew up almost immediately,” adding the type of missile North Korea was testing was still being assessed.