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.

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 ...

Why is Christian Science in our name? Our name is about honesty. The Monitor is owned by The First Church of Christ, Scientist, and we’ve always been transparent about that. The church publishes the ...

Signal offers end-to-end encryption, disappearing messages, and local backups to protect user data ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Former national security adviser Mike Waltz, testified before the Senate Foreign Relations Committee in his bid to become U.N.