• U.S. President Barack Obama and Saudi King Salman (R) walk together following their meeting at Erga Palace in Riyadh, Saudi Arabia
  • President Barack Obama and new Saudi Arabian King, Salman bin Abdul Aziz, are photographed as they shake hands in a bilateral meeting at Erga Palace in Riyadh, Saudi Arabia, Tuesday, Jan. 27, 2015
  • 9/11 Terror Attacks: World Trade Center
  • In this Sept. 11, 2001, file photo, the twin towers of the World Trade Center burn behind the Empire State Building in New York.
  • President Barack Obama and new Saudi Arabian King, Salman bin Abdul Aziz, are photographed as they shake hands in a bilateral meeting at Erga Palace in Riyadh, Saudi Arabia, Tuesday, Jan. 27, 2015
  • As If
  • Fighters of the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL) parade in a commandeered Iraqi security forces armored vehicle down a main road at the northern city of Mosul, Iraq. (File)
  • Saudi King Salman bin Abdulaziz (C) walks surrounded by security officers
  • Bush and Saudi King
  • US Sen. John McCain
  • US President Barack Obama speaks with King Salman (L) of Saudi Arabia during their meeting in the Oval Office at the White House in Washington, DC on September 4, 2015
  • A Saudi man enters a hotel decorated for the Muslim holly month of Ramadan, Riyadh, Saudi Arabia, Monday, June 15, 2015.
  • In this aerial photo made from a helicopter, the Abraj Al-Bait Towers with the four-faced clocks stands over the holy Kaaba, as Muslims encircle it inside the Grand Mosque, during the annual pilgrimage known as the hajj, in the Muslim holy city of Mecca, Saudi Arabia, Friday, Sept. 25, 2015.