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

President Donald Trump ousted his national security adviser, Michael Waltz. Trump’s use of an 18th century law for ...

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

In March, the editor of the Atlantic magazine revealed that national security adviser Michael Waltz had inadvertently ...

Last week, however, Waltz’s phone made headlines again: on Thursday, the same day that Waltz would be ousted from his ...

The national security advisor and his deputy are reportedly leaving their posts, after the former accidentally invited a ...

Trump said he's nominating Michael Waltz to be ambassador to the United Nations, while Secretary of State Marco Rubio will ...

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

Waltz was at the center of the Signal chat controversy, in which a journalist was accidentally included in a discussion of ...

Michael Waltz, who on Thursday was ousted as President Donald Trump’s national security adviser. (Brendan Smialowski/AFP/Getty Images) Michael Waltz had all the right credentials to be national ...

By Maggie Haberman David E. Sanger and Jonathan Swan Reporting from Washington President Trump on Thursday removed his national security adviser, Michael Waltz, and nominated him as ambassador to ...

President Donald Trump’s decision to oust his national security adviser, Michael Waltz, was the product of a slow accumulation of frustration with a former Green Beret officer who was seen as ...