Pope Tawadros II, the 118th Pope of the Coptic Orthodox Church of Alexandria and Patriarch of the See of St. Mark Cathedral, leads Egypt's Coptic Christmas eve mass in Cairo, Egypt, January 6, 2016 (Reuters)

Egypt's President Abdel Fattah al-Sisi (C) greets Christians during Egypt's Coptic Christmas eve mass led by Pope Tawadros II (L), the 118th Pope of the Coptic Orthodox Church of Alexandria and Patriarch of the See of St. Mark Cathedral, in Cairo, Egypt, January 6, 2016 (Reuters)

Women pray during Christmas Eve Mass at St. Mark's Cathedral, in Cairo, Egypt, Wednesday, Jan. 6, 2016 (AP)

People try to shake hands with Egypt's President Abdel-Fattah el-Sissi, center, during Christmas Eve Mass at St. Mark's Cathedral, in Cairo, Egypt, Wednesday, Jan. 6, 2016 (AP)

An elderly woman waves as Egypt's President Abdel-Fattah el-Sissi speaks during Christmas Eve Mass at St. Mark's Cathedral, in Cairo, Egypt, Wednesday, Jan. 6, 2016 (AP)

A boy holds a flower during Christmas Eve Mass at St. Mark's Cathedral, in Cairo, Egypt, Wednesday, Jan. 6, 2016 (AP)

Pope Tawadros II, the 118th Pope of the Coptic Orthodox Church of Alexandria and Patriarch of the See of St. Mark Cathedral, leads Egypt's Coptic Christmas eve mass in Cairo, Egypt, January 6, 2016 (Reuters)

Egypt's President Abdel Fattah al-Sisi (C) greets Christians during Egypt's Coptic Christmas eve mass led by Pope Tawadros II (L), the 118th Pope of the Coptic Orthodox Church of Alexandria and Patriarch of the See of St. Mark Cathedral, in Cairo, Egypt, January 6, 2016 (Reuters)

Coptic Pope Tawadros II, left, greets Egypt's President Abdel-Fattah el-Sissi, during Christmas Eve Mass at St. Mark's Cathedral, in Cairo, Egypt, Wednesday, Jan. 6, 2016 (AP)

Egypt's President Abdel Fattah al-Sisi (C) receives flowers during Egypt's Coptic Christmas eve mass led by Pope Tawadros II, the 118th Pope of the Coptic Orthodox Church of Alexandria and Patriarch of the See of St. Mark Cathedral, in Cairo, Egypt, January 6, 2016 (Reuters)

Egyptian Coptic Christians celebrate Christmas in Cairo, Egypt, on January 06, 2016 (AFP)

Egyptian Coptic Christians celebrate Christmas in Cairo, Egypt, on January 06, 2016 (AFP)

Egypt's President Abdel Fattah al-Sisi (C) greets a priest during Egypt's Coptic Christmas eve mass led by Pope Tawadros II (back), the 118th Pope of the Coptic Orthodox Church of Alexandria and Patriarch of the See of St. Mark Cathedral, in Cairo, Egypt, January 6, 2016 (Reuters)