Top Trump administration officials accidentally leaked secret plans for a strike in Yemen when Jeffrey Goldberg was added to an encrypted Signal chat.

The Atlantic’s Jeffrey Goldberg revealed he was in a Safeway parking lot when he realized a group chat he was added to detailing strikes on Yemen was real.Goldberg reported Monday that National Security Adviser Mike Waltz appeared to have added him to a group chat titled “Houthi PC small group” on the encrypted messaging app Signal.

Goldberg is a journalist who has written for The Washington Post, The Jerusalem Post, The New York Times Magazine and The New Yorker, where he served as a Middle Eastern and Washington correspondent before he started at The Atlantic in 2007. He became the magazine's editor-in-chief nine years later in 2016.