Mike Waltz, the national security adviser for President Donald Trump, is seen in photos using Signal during a Cabinet meeting on April 30.

The messaging app Signal is making headlines again, with the news that U.S. Defense Secretary Pete Hegseth used it for a chat with his wife, his personal lawyer and others in which he shared sensitive ...

Former White House national security adviser Mike Waltz was seen using the encrypted messaging app Signal in photos taken during Wednesday's Cabinet meeting. Waltz was removed as national security ...

Defense Secretary Pete Hegseth violated Pentagon policy that prohibits use of a personal device for official business when he used a Signal chat to discuss military strike plans and failed to properly ...

Apps that delete messages don't comply with Ohio public records law and government employees should avoid using them, Attorney General Dave Yost said.