Waltz’s fate was sealed by his inclusion of a journalist on a sensitive Signal group chat in March. But he had been clashing ...

Former national security adviser Michael Waltz in the Cabinet Room of the White House in March. Shawn Thew / EPA / Bloomberg ...

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

A photo taken this week showed Mike Waltz using an app that looks like—but is not—Signal to communicate with top officials.

Mike Waltz isn’t the only loser after being fired by the Trump administration as national security adviser. Secretary of State Marco Rubio has also topped the list, according to The Daily Show ...

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Waltz inadvertently added The Atlantic's editor-in-chief to a group thread discussing sensitive national security matters.

After weeks of speculation about his future within the Trump administration, national security adviser Mike Waltz is on his ...

President Trump removed his embattled national security adviser, but kept him in his Cabinet, in his first major shake-up of top roles since Inauguration Day.

Waltz’s expected departure appears to signal a tightening focus within the White House on loyalty and ideological ...