Trump administration officials were sued over the Signal leak. By who? American Oversight, a government watchdog. It alleges officials violated federal law by using Signal for security discussions.

The story of how national security officials used the Signal encrypted app to discuss a planned attack on terrorists in Yemen provides key crisis communication lessons.

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

To put it bluntly: no one working for a three-letter agency in Washington trusts President Trump to keep his mouth shut.

Trump calls Waltz "so stupid" for adding journalist to Signal chat discussing military plans. Follow Newsweek's live blog.

When Ukrainian President Volodymyr Zelensky interrupted a press conference he was holding to answer a telephone call from his ...

New reporting in Politico says President Donald Trump wasn't just "upset" with Mike Waltz for being involved in the leaked ...

A Florida politician is at the center of the national security breach that took news headlines by storm this week. Here's what we know.

Top Trump administration officials used the messaging app Signal to debate highly sensitive plans for bombing Yemen and ...

Signal is the government’s choice. According to reports in the New York Times and the Wall Street Journal, Trump and his ...

On Monday it was revealed that top Trump administration officials were using a commercial messaging app to plan military ...