Stephen Miller, serving as Trump's Deputy Chief of Staff and Homeland Security Advisor, is increasingly recognized as a pivotal figure in shaping domestic policies within the White House. Dubbed the 'shadow prime minister' by former strategist Steve Bannon, Miller has been instrumental in advancing Trump's second-term agenda, particularly on immigration and cultural issues. His initiatives include mass immigration arrests and efforts to end birthright citizenship. Despite growing influence, Miller's role has sparked concerns over potential legal and policy controversies.