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 ...

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, ...

President Donald Trump's outgoing national security adviser Mike Waltz was photographed using Signal on his phone during ...

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

Mike Waltz is expected to be ousted from his role as Donald Trump's national security adviser amid the fallout over ‘The ...

Trump’s now former national security adviser was using Signal in a room full of reporters. Here are the photos of his ...

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

Lily Hay Newman Mike Waltz Has Somehow Gotten Even Worse at Using Signal A photo taken this week showed Mike Waltz using an app that looks like—but is not—Signal to communicate with top officials.

Researchers uncover security weaknesses in obscure TM SGNL app and indications that its Israeli maker was itself recently ...

President Trump recently discouraged the use of the Signal app after controversy over a group chat of administration ...