Trump Nominees Mike Waltz as UN Ambassador Amid White House Shake-Up

President Donald Trump has announced a significant shake-up of his national security team, nominating National Security Adviser Mike Waltz to serve as the next U.S. ambassador to the United Nations. Waltz's departure follows a controversy in which he inadvertently added a journalist to a Signal chat used to discuss sensitive military operations against Houthi militants in Yemen—a mishap for which Waltz publicly took responsibility. Secretary of State Marco Rubio will serve as acting national security adviser while retaining his current post until a permanent replacement is named. Waltz, a former Green Beret and congressman, has been a vocal critic of China and a strong supporter of U.S. military interests. The Senate will need to confirm Waltz's nomination, which may prove challenging given the slim Republican majority. The U.N. ambassador post became vacant after Rep. Elise Stefanik withdrew to maintain the GOP's narrow House majority.