Stephen Miller will start as President Trump’s new chief of staff on Monday. As the architect of aggressive immigration policies, he now holds a position of great power. Mr. Trump said, "Stephen's been with me from the beginning." Miller plans to focus on the MAGA coalition and key voter concerns.

The architect of President Trump's mass deportation campaign, Mr. Miller has been the public face of many of Mr. Trump's immigration policies.

Stephen Miller is one of President Trump's longest-serving and most influential aides, and the architect of many of the president's most aggressive border and immigration policies. His rise to White House chief of staff, a role he officially begins Monday, elevates a hard-line policy adviser to a position of pre-eminent power and influence in Mr. Trump's inner circle.

An unabashed champion of Mr. Trump and his agenda in high-profile media appearances, Mr. Miller is a perennial target of critics of the president, who have highlighted his right-wing views. The policies he has driven are expected to be a top focus of congressional Democrats as they take power next year.

People close to Mr. Miller said he had little interest in compromising with Democrats and was prepared for a fight over congressional subpoenas and investigations, as The New York Times reported last week.

The new chief of staff plans to focus on trying to rebuild the fractured MAGA coalition and pursuing policies that will energize the voters who elected Mr. Trump in 2024, they said. He has also privately indicated the need to resolve the Iran war and mitigate the high prices that drove deep voter dissatisfaction in last week's midterm elections.

Mr. Trump has not offered an explanation for his decision to fire Susie Wiles, his former chief of staff, and replace her with Mr. Miller, noting only that "Stephen's been with me from the beginning" and was one of his most trusted advisers.

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Mr. Miller, 41, has advised Mr. Trump for nearly a decade, and has either authored or significantly contributed to many of the president's most high-profile moves. Those include separation of migrant families at the border; the 2017 Muslim travel ban; directing the government to stifle critics of Mr. Trump; the ending of nearly all U.S. refugee programs; the widespread pressure campaign against American universities; extrajudicial boat strikes that have killed hundreds; and purges of officials deemed insufficiently loyal to Mr. Trump.

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