Donald Trump has named Stephen Miller, the architect of his immigration crackdown, as White House chief of staff, replacing Susie Wiles, whom he confirmed was ousted days after Republicans lost control of Congress in the midterms. Miller, a former Jeff Sessions aide behind first-term family separation and travel ban policies, is praised by Trump as a trusted adviser, while critics including Chris Whipple and David Axelrod call the move an aggressive, combative signal toward congressional Democrats.