The abrupt decision signals that Kelly is moving quickly to assert control over the West Wing, which has been characterized by interpersonal disputes and power struggles during Trump’s six months in office.

The retired Marine general, who was sworn in Monday morning, was brought into the White House in the hope that he will bring military-style disciple to Trump’s staff. He has been fully empowered by the president to make significant changes to the organization, White House officials and outside advisers said.