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 ...

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

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 ...

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

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

The Trump administration ousted national security advisor Mike Waltz and other staffers with the National Security Council, ...

Mike Waltz gave up one of the safer seats in Congress to serve as President Donald Trump’s national security adviser (Trump ...

The app Waltz was using appeared to be “TM SGNL,” a modified version of Signal that retains and archives messages to comply ...

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