A messaging app called Signal based in San Francisco was used by the Trump administration to discuss war plans.

Defense Secretary Pete Hegseth and other Trump officials allegedly used Signal for a group chat to discuss a highly sensitive operation.

The app, which was introduced in 2014 and has hundreds of millions of users, is widely viewed as the safest messaging tool ...

Top Trump administration officials used messaging app Signal to share war plans and mistakenly included a journalist in the ...