WASHINGTON (AP) — President Donald Trump said Friday that Stephen Miller was replacing Susie Wiles as White House chief of staff, installing as his closest adviser a loyal, combative bulldog for his “America First” agenda as the president prepares to stare down a newly empowered Democratic Congress next year. Miller, long a key member of Trump’s inner circle, is a key architect of the administration’s hard-line immigration policies. He is one of Trump’s longest-serving aides, joining his long-shot 2016 presidential campaign as a speechwriter.