Top officials from the Trump administration included a journalist in a private chat on Signal while discussing sensitive military strategies, leading to calls from Democratic lawmakers for a congressional investigation into a potential security breach. Under U.S. law, mishandling classified information can result in criminal charges, although it is unclear if violations occurred in this case. Signal is a secure messaging app known for its end-to-end encryption and privacy features, not tracking or storing user data. Founded in 2012 by Moxie Marlinspike, Signal operates independently and is overseen by Meredith Whittaker. It has gained popularity among journalists, government agencies, and organizations, particularly after concerns over other messaging platforms' privacy policies. The app is recognized as a secure method for whistleblowers to communicate confidentially. Despite its security reputation, some analysts question its suitability for national security discussions.