US President Donald Trump (C) and Saudi Arabia's King Salman bin Abdulaziz al-Saud (3-R), Crown Prince of Abu Dhabi Mohammed bin Zayed Al Nahyan (3-L), Jordan's King Abdullah II (2-R), Egyptian President Abdel Fattah al-Sisi (R), pose for a group photo during the Arab Islamic American Summit at the King Abdulaziz Conference Center in Riyadh on May 21, 2017. / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)