National security adviser Mike Waltz is expected to depart from the Trump administration in the coming days, two sources familiar with the matter told CNN, the first major staff shakeup since the president took office in January.

President Donald Trump says he is nominating national security adviser Mike Waltz as United Nations ambassador while Secretary of State Marco Rubio would take over Waltz’s duties on an interim role.

National Security Adviser Michael Waltz attends a meeting in the Oval Office of the White House in Washington, DC, on April 7, 2025. Reporter President Donald Trump is replacing his National Security Adviser,