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

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

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

A new analysis of TM Signal’s source code appears to show that the app sends users’ message logs in plaintext. At least one ...

More than a month after he drew criticism for using Signal to discuss an impending military attack, Waltz was seen using what ...

President Donald Trump says he is nominating national security adviser Mike Waltz as United Nations ambassador while ...

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

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

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

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

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

Photos captured by a Reuters photographer show Mike Waltz holding his phone beneath the table with the Signal app open.