Trump Names Waltz as UN Ambassador, Rubio as National Security Adviser

The president named Secretary of State Marco Rubio as his acting national security adviser.

U.S. Secretary of State Marco Rubio (R) and U.S. national security advisor Mike Waltz hold a meeting with Ukrainian officials in Jeddah, Saudi Arabia, on March 11, 2025. Saul Loeb/AFP via Getty Images

President Donald Trump on May 1 announced that he was naming White House national security adviser Mike Waltz to be the U.S. ambassador to the United Nations after reports indicated that Waltz would be leaving his advisory position.

In a Truth Social post on May 1, Trump wrote that Waltz “has worked hard to put our Nation’s Interests first.”