U.S. President Donald Trump ousted his national security adviser Mike Waltz on Thursday and named Secretary of State Marco Rubio as his interim replacement in the first major shakeup of Trump's inner circle since he took office in January.

FILE PHOTO: U.S. National Security Advisor Mike Waltz joins U.S. Vice President JD Vance for a visit to the U.S. military's Pituffik Space Base in Greenland on March 28, 2025. Jim Watson/Pool via REUTERS/File Photo

White House national security adviser Mike Waltz is leaving the administration just weeks after it was revealed he added a journalist to a Signal chat being used to discuss military plans, according to two people familiar with the matter Thursday.