Former national security adviser Mike Waltz was photographed using a Signal-like messaging app during Wednesday’s Cabinet meeting, more than a month after he first came under intense scrutiny for ...

A magazine journalist's account of being added to a group chat of U.S. national security officials coordinating plans for airstrikes has raised questions about how highly sensitive information is ...

The version of Signal that recently ousted national security adviser Mike Waltz was caught checking during a Cabinet meeting Wednesday is an unofficial edition of the app meant to archive messages, ...

A screengrab of a page from a Pentagon-wide memo warning against using the messaging app Signal. Several days after top national security officials accidentally included a reporter in a Signal chat ...

Mike Waltz, the departing national security adviser at the center of "Signalgate," is seen in new photos using the commercial messaging application during a Cabinet meeting held by President Donald ...