'Pretty sinister': CNN host struck by Trump's ominous remark

A CNN host was struck Tuesday night by a "pretty sinister" remark President Donald Trump made during his nearly 80-minute speech earlier in the day.

Trump gave a speech to mark his one-year anniversary in office, one that meandered through topics ranging from foreign policy to the economy and more. During the question-and-answer part of the briefing, he was asked about how far he is willing to go to annex Greenland.

"You'll find out," Trump said.

His answer stunned CNN host Erin Burnett, who discussed it during the opening segment of her show, "OutFront" on Tuesday.

"Pretty sinister," Burnett said. "And it came on the same day that the prime minister of Greenland warned his people that the country needs to prepare for a possible invasion."

Burnett also shared video clips of some social media posts Trump shared overnight, which seemed to suggest the president is becoming increasingly hostile toward NATO.

In one post that Trump amplified, an anonymous user said "the real threat is NATO" and not China or Russia.

Trump has also threatened to invade Greenland to force its annexation if Denmark does not agree to sell it. Danish officials have said such a move would bring an end to the NATO alliance, which has stood since the end of World War II.