Waltz was among high-ranking members of the administration who accidentally shared plans about a forthcoming U.S. military attack with the editor of the Atlantic magazine on the messaging app.

President Trump is tapping national security adviser Mike Waltz to be his ambassador to the United Nations following reports of his ouster in the midst of a controversy over a group text chat.

Trump removes Mike Waltz as national security adviser, naming him UN ambassador. Rubio steps in as interim. Waltz’s exit follows a Signal chat controversy.