"Late Show" host Stephen Colbert poked fun at President TrumpDonald John TrumpReporters defend CNN's Acosta after White House says he 'disrespected' Trump with question Security costs of Trump visit to Scotland sparks outrage among Scottish citizens Ex-CIA officer: Prosecution of Russians indicted for DNC hack 'ain't ever going to happen' MORE on Thursday after Trump suggested that his promise that North Korea would face "fire and fury" wasn't tough enough, questioning what could possibly be tougher.

"I'd like to go on the record: I do not want the Earth to blow up," Colbert began. "That's where my house is."

"But here's why I'm getting a little nervous," he went on. "Things are getting, uh, tense? Between Donald Trump and [North Korean leader] Kim Jong Un."

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"A firm response is necessary," Colbert said, referring to news that North Korea was working on a plan to launch missiles into waters near the island territory of Guam. "But maybe not 'fire and fury the likes of which the world had never seen,' " he added, doing an impression of Trump.

He then went on to question Trump's remarks Thursday in which he said that his "fire and fury" promise may not have been "tough enough."

“Frankly, the people who were questioning that statement, was it too tough? Maybe it wasn’t tough enough,” Trump said Thursday.

Colbert pounced on the remark: “What is tougher than ‘fire and fury?' " he asked. “Lava and rage? A paper cut and a lemon?”

Playing a video of a reporter questioning Trump on what he meant, Colbert mocked Trump's response of "we'll see."

“We’ll see?” Colbert shot back. “I know we’ll see, but it might be the last thing we see!”