Four Republican members of congress have filed this amicus curiae brief in the U.S. Supreme Court, in Utah Republican Party v Cox, 18-450. The brief depends on political science research and has an interesting history of how political parties in the U.S. have nominated, all throughout history. The two U.S. Senators are Mike Lee of Utah and Ted Cruz of Texas. The two U.S. House members are Paul Labrador of Idaho and Rob Bishop of Utah.