NPR's Up First newsletter leads with President Trump naming Stephen Miller, his deputy chief of staff and key architect of his immigration policies, as chief of staff, replacing Susie Wiles, while the lame-duck Congress works to keep the government funded past December 11, 2026. It also covers Nvidia's probe into Jensen Huang over alleged Chinese espionage ties, Russell Brand's sexual assault convictions, Pope Leo XIV's South America trip, climate change altering nature's colors, and a reported 6% drop in homelessness.