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.

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.