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

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

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 ...

President Donald Trump announced that Mike Waltz had been ousted as national security advisor. He was previously caught up in ...

National Security Advisor Mike Waltz is expected to leave his post in the Trump administration on the heels of controversy ...

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

National security adviser Mike Waltz and his deputy, Alex Wong, are exiting the administration, CBS News’s Jennifer Jacobs ...

Mike Waltz's exit from the Trump administration comes on the heels of the Signal chat scandal. Here's what happened.

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