It was President al-Sisi who exiled the Muslim Brotherhood and formed a coalition of Arab nations to confront the extremist elements promoting violence.
President al-Sisi’s call to confront extremism was joined by King Abdullah III (Jordan) in 2014; and that eventually led to Saudi Arabia and the Gulf States uniting and forming an anti-extremism Arab coalition. [Backstory Here]
President al-Sisi delivered a 2015 New Year speech to the the most influential Islamic scholars and faith leaders calling upon internal reform to confront the radical elements within the Muslim faith. Saudi King Abdullah bin Abdulaziz honored President al-Sisi for his efforts at creating a stable coalition for peace just prior to his death a few weeks later in late January 2015.
After taking power in 2015 Saudi King Salman took up the cause for al-Sisi’s peace coalition, and that was the beginning of a series of events that culminated in this 2017 Arab Islamic American Summit. If regional peace is achieved, history will show how significant Egyptian President Abdel Fattah al-Sisi was in that result.