A U.S. Coast Guard lieutenant and self-identified white nationalist was arrested after federal investigators uncovered a cache of weapons and ammunition in his Maryland home that authorities say he stockpiled to launch a massive domestic terror attack targeting politicians and journalists. Christopher Paul Hasson called for “focused violence” to “establish a white homeland” and dreamed of ways to “kill almost every last person on earth,” according to court records filed in U.S. District Court in Maryland. Though court documents do not detail a specific planned date for an attack, the government said he had been amassing supplies and weapons since...