Signal’s convenience and the lack of clear agency guidelines makes the commercial app a popular choice for government officials. But transmitting sensitive information is still prohibited.

Downloads of the app surged in the past week after the Atlantic published White House officials’ texts about a military ...

The military takes extraordinary measures to keep combat operations secret, cutting off outside communications for service ...

The Trump administration is weakening the intelligence community’s ability to both keep Americans safe and compete with our ...

The Trump administration is investigating how the Goldberg error happened, as well it should. It seems unlikely that anyone ...

Plans for an attack against an enemy target are classified in America. But the private views of high-ranking officials about ...

You don't have to be more Catholic than the Pope, as the saying goes. But over the past week, an accidental leak to The ...

Rep. Jim Himes (D-CT) clashed with Fox News host Will Cain on Tuesday over a bombshell report that top Donald Trump ...

The White House deputy chief of staff and Mr. Trump’s homeland security adviser was identified as “S M” in the Signal chat.