BLUFFTON -- New York business mogul Donald Trump and U.S. Sen. Lindsey Graham traded insults Tuesday as two 2016 GOP presidential rivals on opposite ends of recent polls turned the White House campaign into a personality clash. Graham called Trump a "jackass" repeatedly during a Tuesday morning national television interview. Trump responded that the South Carolina Republican was an "idiot" during a speech in Bluffton, S.C., and gave out Graham's personal phone number. The barbs came after Trump has said Mexico is sending criminals and rapists into the United States and U.S.