President Trump nominated Waltz to be U.S. ambassador to the United Nations in May after he was ousted as national security ...

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 on April 30.

Senate Democrats will get a chance to scrutinize President Trump’s former national security adviser over his mishandling of ...

A photo taken this week showed Mike Waltz using an app that looks like—but is not—Signal to communicate with top officials. "I don't even know where to start with this," says one expert.

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

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

More than a month after he drew criticism for using Signal to discuss an impending military attack, Waltz was seen using what appears to be a different messaging app to message others in the Trump ...

Knock-off Signal app Mike Waltz was caught using can be hacked in ‘15 to 20 minutes,’ report says Days after former National Security Adviser Mike Waltz was caught using a knock-off Signal app ...

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

Mike Waltz Caught Using App Even Less Secure Than Signal Trump’s recently ousted national security advisor just keeps making things worse for himself.

President Donald Trump has nominated Mike Waltz to be the next U.S Ambassador to the United Nations just hours after firing him as national security advisor. Waltz was axed after accidentally ...