Stephen Miller is an American political advisor known for his role in the Trump administration, where he served as a senior advisor for policy. He is widely regarded as the architect of many of the administration's controversial immigration policies, including the travel ban targeting several Muslim-majority countries and the separation of families at the U.S.-Mexico border. Miller's hardline stance on immigration and his promotion of nationalist ideas have drawn both strong support and intense criticism. Prior to his White House role, he worked as a staffer for several Republican members of Congress.