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

President Donald Trump announced that Mike Waltz had been ousted as national security advisor. He was previously caught up in "Signalgate."

White House national security advisor Mike Waltz is set to depart the administration, according to two people familiar with the matter Thursday, marking the first major staff shakeup of President Trump’s second term.