Republican presidential candidate Donald Trump (L) looks on as Egyptian President Abdel Fattah el-Sisi speaks during a meeting at the Plaza Hotel on September 19, 2016 in New York. (DOMINICK REUTER/AFP/Getty Images)
Atef's grandchildren present on their right wrist the tattoo of a blue cross, a sign of their belonging to the Copts of Egypt, Cairo, November 9, 2010. (Alvaro Canovas/Paris Match via Getty Images)
A nun reacts to the scene of a bomb explosion at the Saint Peter and Saint Paul Coptic Orthodox Church on December 11, 2016, in Cairo's Abbasiya neighbourhood. (KHALED DESOUKI/AFP/Getty Images)
Broken windows are seen after an explosion at Saint Mark's Coptic Orthodox Cathedral in Cairo, Egypt on December 11, 2016. (Ahmed Gamil /Anadolu Agency/Getty Images)
A crucifix is seen hanging as Egyptians attend a candle vigil on December 17, 2016 outside the Saint Peter and Saint Paul Coptic Orthodox Church in Cairo. (KHALED DESOUKI/AFP/Getty Images)
Iraqi Christians attend a Christmas mass at the Catholic Church of Our Lady of Deliverance/Salvation (Sayidat al-Nejat), in central Baghdad, on December 25, 2015. (AHMAD AL-RUBAYE/AFP/Getty Images)