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President Trump named Stephen Miller, the architect of his hardline immigration policy, as White House chief of staff on Friday, replacing Susie Wiles, who is stepping down. Miller takes over on Monday. Wiles was Trump's longest-serving chief of staff and the first woman in the job. PBS NewsHour reported the move follows a crushing midterm defeat in which immigration, once a strength, became a liability after two years of mass detentions and deportations. BBC and PBS analysis says the pick signals a doubling down on Trump's agenda and sets up likely clashes with a Democratic-led Congress.