In an uncharacteristic move, Megyn Kelly put President Donald Trump on blast this week over his “negotiation tactics” in the Iran war, which have found him embracing his most extreme public rhetoric to date.

On Tuesday’s episode of her SiriusXM radio show, Kelly declared she was “sick of this shit,” referring to Trump’s incendiary post on his Truth Social platform that morning in which he pledged “a whole civilization will die” if no deal between the U.S. and Iran could be reached by that evening.

“I’m sick of it. Can’t he just behave like a normal human?” the former Fox News host said. “Just shut up ― fucking shut up about that shit! You don’t threaten to wipe out an entire civilization. We’re talking about civilians, just casually in a social media post.”

No stranger to Trump’s social media attacks, Kelly said she considered her experience being on the receiving end of the president’s criticism “a gift,” given that it helped her “really come to understand” his online strategy. Still, she condemned Trump’s Iran threat as “completely irresponsible and disgusting,” adding: “He should not be doing it.”

Watch a clip of Megyn Kelly’s comments on Trump’s Iran threat below.