Waltz inadvertently added The Atlantic's editor-in-chief to a group thread discussing sensitive national security matters.

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.

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,