The abrupt personnel shake-up has roiled the Pentagon’s inner sanctum and left other officials wondering who else could be ...

On Friday, 37-year-old Graciela Xiomara Castellanos was arrested after police found her unresponsive daughter, Rebecca, in a ...

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 ...

Dan Caldwell was listed as the Pentagon's point of contact by Defense Secretary Pete Hegseth in the infamous Signal group ...

Caldwell’s sudden downfall was tied to an investigation into unauthorized disclosure of department information.

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