Officials inadvertently added a reporter to an unsecured group chat discussing plans for a U.S. attack on Houthis in Yemen.

Signal’s convenience and the lack of clear agency guidelines makes the commercial app a popular choice for government ...

Atlantic publishes attack plan details after Trump, top officials deny classified information was shared in group chat ...

Here's how the incident played out earlier this month, based on reporting from The Atlantic and from the wire service Reuters ...

The United States witnessed one of the most shocking national security indiscretions in years when a journalist was ...