President Donald Trump ousted Mike Waltz, who has lost the confidence of other administration officials, from his national security adviser position on Thursday.

Mike Waltz, Trump's national security advisor, is leaving the White House weeks after he accidentally added a journalist to a Signal chat.

President Trump announced a major shakeup in his national security team on Thursday, tapping Mike Waltz to be his United Nations ambassador while Secretary of State Marco Rubio will fill Waltz’s ...

National security adviser Mike Waltz is leaving his post and will become America’s ambassador to the United Nations, marking the first major shakeup of President Trump’s second administration.