A Wisconsin teenager is accused of killing his parents as part of an extremist plot to assassinate President Donald Trump and start a revolution to “save the white race,” newly unsealed federal court documents show. Nikita Casap, 17, was arrested last month after his mother, 35-year-old Tatiana Casap, and stepfather, 51-year-old Donald Mayer, were found dead inside their home in Waukesha, just east of Milwaukee. He was charged with two counts of first-degree intentional homicide and other crimes, the Waukesha County Sheriff’s Department announced on March 27. This week, a search warrant filed with the U.S. District Court for the...