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.

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 ...

The chat app got an unusual kind of endorsement after U.S. national-security officials were revealed to be using it to share information about a pending U.S. military strike.

CIA Director John Ratcliffe testified that using Signal for work is allowed by the CIA. The Atlantic's editor-in-chief was added to a Signal chat where Trump officials discussed war plans. Trump ...

Waltz never seems to have learned his lesson, however, as a photo taken just yesterday shows Waltz using the app while in a meeting at the White House.

Yes, Biden admin authorized use of Signal — but not for sensitive military intel The claims spread after members of President Donald Trump's White House accidentally added The Atlantic's editor ...