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Military leaders, past and present, "know the risks of escalation, they know just how dangerous the situation is, and I think they are governors on the president's instincts to continue to try to intimidate and bully," said Brennan, who served as the CIA chief during President Barack Obama’s second term.

And while Trump, as president, would have "unilateral authority to be able to authorize military action," the order to do so "goes through Secretary Mattis," who could "either try to talk him out of it, disagree with it, carry it out, or, or not," Brennan said.

Brennan added that Mattis, Dunford and Kelly were "patriots" who "understand the gravity of the situation" in North Korea, while saying he believes that Trump doesnot.

Trump has fired increasingly dire warnings of military action at Pyongyang in recent months. In September, he said the U.S. was "totally prepared" for "devastating" action, just a day after North Korea's foreign minister said the president had "declared war" on his country and that Kim's regime would consider shooting down American bombers.

Brennan said that such "caustic" talk showed Trump was "trying to intimidate opponents" but that it had only resulted in raising tensions, not lessening them.

"I’m concerned there could be some kind of clash between North Korean and South Korean forces," he said.