Saudi Crown Prince Mohammad Bin Salman takes part in a ribbon cutting ceremony while inspecting investment projects with Egyptian President Abdel Fattah al-Sisi in the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency.

Saudi Crown Prince Mohammad Bin Salman shakes hands with members of Egypt's government after arriving at the Ittihadiya presidential palace in Cairo, Egypt, March 4, 2018 in this handout picture courtesy of the Egyptian Presidency. Picture taken March 4, 2018. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi (R) and Saudi Crown Prince Mohammad Bin Salman (L) visit the city of Ismailia, Egypt March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Pope Tawadros II, head of the Egyptian Coptic Orthodox Church, receives Saudi Crown Prince Mohammad Bin Salman in Cairo, Egypt March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS

Egyptian President Abdel Fattah al-Sisi (R) welcomes Saudi Crown Prince Mohammad Bin Salman (L) at Cairo Airport, Egypt, March 4, 2018. in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi poses for a photograph with Saudi Crown Prince Mohammad Bin Salman at the Ittihadiya presidential palace in Cairo, Egypt, March 4, 2018 in this handout picture courtesy of the Egyptian Presidency. Picture taken March 4, 2018. The Egyptian Presidency/Handout via REUTERS. Image used for illustrative purpose.

Egyptian President Abdel Fattah al-Sisi (R) and Saudi Crown Prince Mohammad Bin Salman visit the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi and Saudi Crown Prince Mohammad Bin Salman visit the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi (3rd L) attends a concert with Saudi Crown Prince Mohammad Bin Salman (2nd L) in Cairo's Opera House, Egypt, March 5, 2018. in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS

A banner, reading "Egypt and Saudi, one hand, one nation" and showing Egyptian President Abdel Fattah al-Sisi shaking hands with Saudi Arabia's King Salman to welcome Saudi Crown Prince Mohammad Bin Salman, hangs in downtown Cairo, Egypt March 5, 2018.

Egyptian President Abdel Fattah al-Sisi (R) and Saudi Crown Prince Mohammad Bin Salman visit the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS

Saudi Crown Prince Mohammad Bin Salman inspects investment projects with Egyptian President Abdel Fattah al-Sisi in the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi shakes hands with members of Saudi Arabia's government at the Ittihadiya presidential palace in Cairo, Egypt, March 4, 2018 in this handout picture courtesy of the Egyptian Presidency. Picture taken March 4, 2018. The Egyptian Presidency/Handout via REUTERS.

Sheikh Ahmed Mohamed el-Tayeb, Egyptian Imam of al-Azhar Mosque receives Saudi Crown Prince Mohammad Bin Salman in Cairo, Egypt March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Saudi Crown Prince Mohammad Bin Salman (L) inspects investment projects with Egyptian President Abdel Fattah al-Sisi in the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi (L) welcomes Saudi Crown Prince Mohammad Bin Salman (R) at Cairo Airport, Egypt, March 4, 2018. in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi (R) looks at Saudi Crown Prince Mohammad Bin Salman as he signs in while visiting the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Saudi Crown Prince Mohammad Bin Salman (L) inspects investment projects with Egyptian President Abdel Fattah al-Sisi in the Suez Canal at the city of Ismailia, Egypt, March 5, 2018, in this handout picture courtesy of the Egyptian Presidency. The Egyptian Presidency/Handout via REUTERS.

Egyptian President Abdel Fattah al-Sisi meets with Saudi Crown Prince Mohammad Bin Salman at the Ittihadiya presidential palace in Cairo, Egypt, March 4, 2018 in this handout picture courtesy of the Egyptian Presidency. Picture taken March 4, 2018. The Egyptian Presidency/Handout via REUTERS.