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An Iraqi Shiite member of the Popular Mobilisation units holds a portrait of prominent Shiite Muslim cleric Nimr al-Nimr during a demonstration against his execution by Saudi authorities, on January 6, 2016, in the holy Shiite city of Karbala. Nimr was a charismatic religious leader who delivered fiery speeches demanding more rights for his minority in the Sunni-ruled kingdom. His execution led to Shiite protests in several Muslim countries and attacks on Saudi diplomatic missions in Riyadh's regional rival Tehran. AFP PHOTO / MOHAMMED SAWAF / AFP / MOHAMMED SAWAF (Photo credit should read MOHAMMED SAWAF/AFP/Getty Images)

An Iraqi Shiite member of the Popular Mobilisation units holds a portrait of prominent Shiite Muslim cleric Nimr al-Nimr during a demonstration against his execution by Saudi authorities, on January 6, 2016, in the holy Shiite city of Karbala. Nimr was a charismatic religious leader who delivered fiery speeches demanding more rights for his minority in the Sunni-ruled kingdom. His execution led to Shiite protests in several Muslim countries and attacks on Saudi diplomatic missions in Riyadh's regional rival Tehran. AFP PHOTO / MOHAMMED SAWAF / AFP / MOHAMMED SAWAF        (Photo credit should read MOHAMMED SAWAF/AFP/Getty Images)