The editors-in-chief of Mother Jones magazine on Friday demanded that Fox News host Bill O’Reilly apologize for saying one of their journalists “deserves to be” in “the kill zone.”

After the liberal magazine published a report accusing O’Reilly of inflating his record while covering the Falklands War, O’Reilly slammed one of the article’s authors, David Corn, in an interview with AdWeek’s TVNewser.

“I’ve talked to about eight or nine reporters, and when they verify what I’m saying, because it’s easily verifiable, then I expect David Corn to be in the kill zone. Where he deserves to be,” O’Reilly told the website.

Clara Jeffery and Monika Bauerlein, editors-in-chief of Mother Jones, wrote a letter to Fox News executive vice president Bill Shine and spokesperson Dana Klinghoffer demanding O’Reilly apologize, Politico reported on Friday.

“We welcome criticism, but calling for our reporter ‘to be in the kill zone’ crosses a line,” they wrote. “Like everyone in media today, we are concerned about the safety of our staff. We’d have hoped that statements with this kind of violent tone would not come from a fellow media professional.”

The editors asked O’Reilly to retract his remark either on air during his show “The O’Reilly Factor” on Friday night, or in a separate statement.