However, by the early 1960s an intense rivalry between the King and his half-brother, Faisal of Saudi Arabia emerged, fueled by doubts in the royal family over Saud's competence. This was of special concern given the Arab Cold War between Gamel Abdel Nasser's United Arab Republic and the pro-U.S. Arab monarchies. As a consequence, Saud was deposed in favor of Faisal in 1964.[7]