The acting director of Immigration and Customs Enforcement, Ron Vitiello, is the latest Homeland Security official to leave the agency. The announcement came Wednesday and follows a string of high-profile exits, starting with DHS head Kirstjen Nielsen’s ouster on Sunday. The departmental “purge” is said be part of a plan by Trump adviser Stephen Miller to steer the administration toward even more hard-line immigration policies. Last week, Trump withdrew Vitiello’s nomination to head ICE, indicating he wasn’t “tough” enough for the role.