President Donald Trump has named Stephen Miller, 41, as White House chief of staff, replacing Susie Wales, in a major administration shakeup following Republican losses in the midterm elections. Miller, currently deputy chief of staff and one of Trump's closest advisers, will take office on November 9. Wills, the first woman to serve as White House chief of staff, will move to the Trump Political Activity - the political organization working for Donald Trump outside of the official White House administration. A Jewish-American political strategist and a leading architect of Trump's America First immigration agenda, Miller is known for advocating strict border enforcement, mass deportations and restrictions on immigration, including from several Muslim-majority countries. He is also an ardent supporter of Israel and Trump's policies in the Middle East. His elevation suggests a more ideologically assertive White House as Trump prepares to confront a Democratic-controlled Congress. The president separately confirmed the security of Defense Secretary Pete Hegseth despite speculation about more personnel changes. Stephen Miller to Trump: I pledge to you, and I pledge to you, Mr. President, my absolute loyalty, my unwavering commitment, and my absolute dedication to your success and the success of this country.