National security voices across Washington are reeling Monday following reports that top Trump Administration officials mistakenly provided detailed military plans to the editor of the Atlantic Magazine in advance of its recent strikes against Houthi rebels in Yemen.

Jeffrey Goldberg, the magazine’s editor-in-chief, claims in a blockbuster article that National Security Advisor Michael Waltz invited him — seemingly by accident — into a private chat group on Signal, an encrypted messaging service, where Secretary of Defense Pete Hegseth posted “operational details of forthcoming strikes on Yemen, including information about targets, weapons the U.S. would be deploying, and attack sequencing.”