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

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

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

President Donald Trump's national security adviser Michael Waltz is expected to leave his post, sources familiar with the decision told ABC News.

A Reuters photographer captured an image of Michael Waltz’s phone screen during a White House cabinet meeting, a day before ...

President Donald Trump, accompanied by national security adviser Michael Waltz, right, takes a question from a reporter during a meeting with NATO Secretary General Mark Rutte at the White House on ...

Surprise! Rather than firing national security adviser Michael Waltz after Signalgate, President Trump is sending him through ...

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

The fired national security adviser engaged in intense coordination with Israeli Prime Minister Benjamin Netanyahu about ...