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

Former national security adviser Mike Waltz was photographed using a Signal-like messaging app during Wednesday’s Cabinet meeting, more than a month after he first came under intense scrutiny for ...

In a statement, the department said the app serves as a supplemental communication tool, similar to phone calls, text ...

Add Yahoo as a preferred source to see more of our stories on Google. While testifying at a Senate hearing on his nomination for U.S. ambassador to the United Nations on Tuesday, Waltz was asked about ...

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