The newly appointed interim national security adviser is preparing to stay in that role for up to six months, a person close to him said.

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