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Pope Francis hugs Sheikh Ahmed el-Tayeb, Grand Imam of Al-Azhar, the pre-eminent institute of Islamic learning in the Sunni Muslim world, in Cairo Egypt, Friday, April 28, 2017. Francis is in Egypt for a two-day trip aimed at presenting a united Christian-Muslim front that repudiates violence committed in God's name. (Photo by Fayed El-Geziry/NurPhoto via Getty Images)

Pope Francis hugs Sheikh Ahmed el-Tayeb, Grand Imam of Al-Azhar, the pre-eminent institute of Islamic learning in the Sunni Muslim world, in Cairo Egypt, Friday, April 28, 2017. Francis is in Egypt for a two-day trip aimed at presenting a united Christian-Muslim front that repudiates violence committed in God's name. (Photo by Fayed El-Geziry/NurPhoto via Getty Images)