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

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

There are some hurdles former National Security Advisor Mike Waltz must clear first before the United Nations ambassador job ...

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

The Democratic senator will not vote to confirm the ex-national security adviser, who she says is "failing up" after putting the U.S. at risk with the Signalgate scandal.

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

Democrats on the Foreign Relations Committee, the panel that will weigh Mike Waltz’s nomination for United Nations ambassador ...