Stephen Miller takes over as Trump's chief of staff after shaping immigration crackdowns

Stephen Miller, a top adviser to President Trump, will become White House chief of staff on Monday, a role in which he will oversee the administration after being the architect of its most controversial immigration policies. Trump announced the change on Friday, replacing Susie Wiles, and called Miller one of his "most trusted" advisers. The shift follows Republican losses in the midterm elections and as Democrats plan investigations into the administration's actions, including its immigration enforcement. Miller helped develop the first-term travel ban on several Muslim-majority countries and the 2018 zero-tolerance policy that led to family separations. In the second term, he pushed for mass arrests, the use of the Alien Enemies Act for deportations, and the deployment of the National Guard.