President Donald Trump threatened to force a news organization to turn over the name of an anonymous source who revealed details about a U.S. airman who went missing in Iran, The Washington Post reported. 

Several outlets reported on the lost airman, who was subsequently rescued after his fighter jet was shot down.

“We’re looking very hard to find that leaker,” Trump said in a press briefing Monday. “They didn’t know there was somebody missing until this leaker gave the information. So whoever it was, we think we’ll be able to find it out because we’re going to go to the media company that released it, and we’re going to say, national security, give it up or go to jail.”