"I think it will be a brutal confirmation hearing," Sen. Mark Warner said of Mike Waltz. "I think he's going to have tough ...

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

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

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.

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

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

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.

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

Donald Trump removed Mike Waltz from his post as national security adviser — marking the first significant personnel overhaul ...

Mike Waltz faces scrutiny after a photo revealed his use of TM SGNL, a modified Signal app, raising security concerns due to ...

The images, captured by Reuters, show Mike Waltz, the former national security adviser, using the TM SGNL app, which allows ...