Days after former National Security Adviser Mike Waltz was caught using a knock-off Signal app, a hacker broke into the system.

More than a month after he drew criticism for using Signal to discuss an impending military attack, Waltz was seen using what appears to be a different messaging app to message others in the Trump ...

President Trump recently discouraged the use of the Signal app after controversy over a group chat of administration officials detailed military plans.

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

Photo appears to show Mike Waltz using Signal-like app that can archive messages More than a month after he drew criticism for using Signal to discuss an impending military attack, Waltz was seen ...