National security adviser Michael Waltz is expected to depart his post, according to numerous media reports citing anonymous U.S. officials.

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

President Donald Trump plans to replace national security adviser Michael Waltz, one current and one former official said Thursday, marking his administration’s most significant foreign policy shake-up to date as the president seeks to advance his “America First” agenda while managing internal divisions,