A watchdog group has said the exchanges on the Signal app were federal records, and sued in an effort to preserve them.

From a national security breach to “The Group Chat” series on TikTok, the messy dynamics of group communication are igniting ...

An image of the Signal app is shown on a mobile phone in San Francisco, March 18. LONDON — A magazine journalist's account of being added to a group chat of U.S. national security officials ...