Signalgate was the national security adviser’s most glaring mistake. But his problems ran deeper. After Michael Waltz, the national security adviser, inadvertently included The Atlantic ’s editor in chief in a group chat about military attack plans on the Signal messaging app, he found himself on very thin ice with his boss.

President Trump's national security adviser Mike Waltz and deputy Alex Wong are leaving the White House, multiple sources tell CBS News.

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