Darin Selnick, US deputy chief of staff, faces suspension amid a probe into Pentagon leaks linked to a Signal group chat.

John Ullyot, the former senior Pentagon spokesperson who was sidelined last month amid growing controversies at the Defense ...

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 ...