FBI Deputy Director Andrew McCabe resigned effective immediately Monday.

A source familiar with the situation told the Washington Examiner than McCabe is taking “terminal leave” for now until he can officially retire when his pension kicks in.

NBC reported that his retirement would take effect mid-March. In December, the Washington Post first reported his retirement would come in the spring.

McCabe, who at one point was acting director from May to August 2017 after President Trump abruptly fired then-director James Comey, has been at the center of tensions between the White House and FBI leadership in recent months. Comey appointed McCabe to be deputy director in January 2016.