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

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

There are some hurdles former National Security Advisor Mike Waltz must clear first before the United Nations ambassador job ...

A phone app that Mike Waltz, President Donald Trump’s former national security adviser, apparently used to save his text messages has temporarily suspended its services as it investigates a ...

More than a month after he drew criticism for using Signal to discuss an impending military attack, Waltz was seen using what ...