Stephen N. Miller (born August 23, 1985) is an American political advisor serving as White House deputy chief of staff for policy and homeland security advisor since 2025. He previously served as senior advisor to the president and director of speechwriting from 2017 to 2021 during the first Trump administration. Considered one of the most influential figures of the Trump administrations and Trumpism movement, his politics have been described as far-right, anti-immigration, and white nationalist.