Here's the video of Egyptian President al-Sisi at Saint Mark's Cathedral in ‘Abbasiyya. Although Ahram Online says he "attended" the Mass, it also indicates he left after greeting Pope Tawadros and making the speech (to the cheers and applause of the congregation) shown below. (A solemn Coptic Mass can run several hours.) clearly his gesture was well-received despite reports of very heavy security. His remarks centered around the theme "we are all Egyptians" and people should top using terms that differentiate among Egyptians.