Signal was used for a secret group chat among senior U.S. officials, which included discussions about a military strike against the Houthi group in Yemen. This incident was revealed when Jeffrey Goldberg, editor-in-chief of the Atlantic, was inadvertently included in the chat. Senate Majority Leader Chuck Schumer criticized the leak as "one of the most stunning" in military intelligence history and called for an investigation. Signal has an estimated 40 to 70 million monthly users and is known for its end-to-end encryption, which ensures message privacy. However, experts warn that using Signal for sensitive national security discussions is unusual, as such conversations typically occur on secure government systems. There are concerns about potential legal issues with disappearing messages on Signal, particularly regarding official record-keeping. The ongoing debate over end-to-end encryption has seen companies like Signal resist governmental attempts to create backdoors for monitoring communications.