Dr. Sebastian Gorka hit back at some of the critics of President Trump over the North Korean nuclear threat and defended the president's stern message.

Trump delivered a stark warning to hermit dictator Kim Jong Un yesterday, saying "fire and fury" would come from the United States if the threats continue.

U.S. intelligence believes North Korea now possesses a nuclear warhead small enough to fit inside a missile, crossing a key threshold.

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Some critics, including top Democrats and Sen. John McCain (R-Ariz.), disagreed with the president's rhetoric, which some saw as threatening a nuclear confrontation.

"I'm not sure how that helps," said McCain.

Gorka, a deputy assistant to the president, said the message to Pyongyang from Trump is clear: "don't test this White House."

"We were a superpower. We are now a hyperpower. Nobody in the world, especially not North Korea, comes close to challenging our military capabilities," he said.

Calling out the president's critics, Gorka called for Washington to put politics aside and come together.

Gorka said the criticism in difficult times "saddens me," likening this to the Cuban Missile Crisis under John F. Kennedy.

"We need to come together. Anybody, whether a member of Congress or a journalist, who thinks [their] politics trumps the national security of America, that's an indictment of you. You need to ask yourself: what's more important? My political party or America. There's only one correct answer to that," he said.

Watch the interview above and see Dr. Gorka take on MSNBC hosts, here.

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