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 ...

The app Waltz was using appeared to be “TM SGNL,” a modified version of Signal that retains and archives messages to comply with presidential records preservation requirements. Newly ousted national ...

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 ...

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 ...

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 ...