Here's what to know about the messaging app used by Trump Administration officials to discuss military strikes on Yemen.

Government watchdogs say it’s a slippery slope for the mayor to continue using the controversial encrypted messaging app.

President Donald Trump's former national security adviser Mike Waltz was photographed using Signal during a Cabinet meeting on Wednesday, just one day before the president announced he was replacing ...

Mike Waltz, the departing national security adviser at the center of "Signalgate," is seen in new photos using the commercial messaging application during a Cabinet meeting held by President Donald ...

Former national security adviser Mike Waltz was photographed using a Signal-like messaging app during Wednesday’s Cabinet meeting, more than a month after he first came under intense scrutiny for ...

Defense Secretary Pete Hegseth reportedly had an internet connection that bypassed Pentagon security protocols set up in his office to use the Signal app on a personal computer. (Mark Schiefelbein/AP) ...

On ThursdaY, Reuters published a photo depicting then-United States national security adviser Mike Waltz checking his phone during a cabinet meeting held by President Trump in the White House. If you ...

WASHINGTON (AP) — The Pentagon’s watchdog found that Defense Secretary Pete Hegseth put U.S. personnel and their mission at risk when he used the Signal messaging app to convey sensitive information ...