Democrat Ammar Campa-Najjar has deleted an Instagram post in which he referred to his grandfather, Palestinian terrorist Muhammad Yousef al-Najjar, as a legend. Muhammad Yousef al-Najjar was was a senior member of the Palestinian terrorist group Black September that murdered 11 Israeli athletes at the 1972 Munich Olympics, according to the Times of Israel, and a deputy for Palestine Liberation Organization (PLO) leader Yasser Arafat.