A photo taken this week showed Mike Waltz using an app that looks like—but is not—Signal to communicate with top officials.

Former national security adviser Mike Waltz was photographed using a Signal-like messaging app during Wednesday’s Cabinet ...

Former national security adviser Mike Waltz was photographed using a Signal-like messaging app during Wednesday’s Cabinet ...

Mike Waltz was photographed using Signal in a Cabinet meeting the day before Trump announced he was replacing him as national ...

Waltz was at the center of the Signal chat controversy, in which a journalist was accidentally included in a discussion of ...

Democrats are preparing to grill Mike Waltz about the Signal chat scandal when he appears at a confirmation hearing to be the ...

President Donald Trump's outgoing national security adviser Mike Waltz was photographed peaking at his phone under the table ...

A photo of Mike Waltz's phone appeared to show that he was using TeleMessage, an app that modifies Signal and other ...

Waltz was among high-ranking members of the administration who accidentally shared plans about a forthcoming U.S. military ...

Mike Waltz, the national security adviser for President Donald Trump, is seen in photos using Signal during a Cabinet meeting ...

Waltz inadvertently added The Atlantic's editor-in-chief to a group thread discussing sensitive national security matters.

America has been bombing Yemen for two decades. That conflict ultimately led to Waltz’s dismissal as national security ...