The probe, announced via podcast, has been widely criticized.

A dozen current and former officials confirmed that the encrypted messaging app is used across various agencies — despite warnings about its security vulnerabilities.

After messages from Mike Waltz's leaked chat on the Signal app went massively public months ago, he was ousted as President Donald Trump's top national security adviser. Now, he's up for a new ...

FBI Director Kash Patel said that he had opened an investigation into the Signal text chats that Minnesota residents are using to share information about ICE.

The FBI director, Kash Patel, said the inquiry followed a far-right influencer’s post about anti-ICE Signal chats ...

Republican prosecutor Brad Miller denied that he has Signal on his phone, but Phoenix New Times has seen the messages.

US Defense Secretary Pete Hegseth risked endangering troops by using the Signal messaging app to discuss a strike on Houthis in Yemen, sources say a Pentagon watchdog report finds.Key points Hegseth's ...

Former national security adviser Mike Waltz, testified before the Senate Foreign Relations Committee in his bid to become U.N. ambassador, stood by the use of Signal in a chat that discussed sensitive ...