Iran's Supreme Leader must be a cleric under Iran's system of vilayat-e faqih: guardianship of Islamic jurist, according to Reuters. A CNN report quoting experts and analysts named five candidates, including Khamenei's son Mojtaba Khamenei, as potential contenders for the position. Other candidates are Alireza Arafi, Mohammad Mehdi Mirbagheri, Hassan Khomeini and Hashem Hosseini Bushehri.