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Saudi Crown Prince Mohammed bin Salman attends a meeting with Lebanon's Christian Maronite patriarch on November 14, 2017, in Riyadh. Saudi Arabia's King Salman hosted the head of the Lebanese Maronite church Beshara Rai, a historic first at a time when Riyadh is stepping up the pressure on Iran-backed Hezbollah. / AFP PHOTO / Fayez Nureldine (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

Saudi Crown Prince Mohammed bin Salman attends a meeting with Lebanon's Christian Maronite patriarch on November 14, 2017, in Riyadh.
Saudi Arabia's King Salman hosted the head of the Lebanese Maronite church Beshara Rai, a historic first at a time when Riyadh is stepping up the pressure on Iran-backed Hezbollah. / AFP PHOTO / Fayez Nureldine        (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

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Lebanon's Christian Maronite patriarch Beshara Rai (L) meets with Saudi Crown Prince Mohammed bin Salman on November 14, 2017, in Riyadh. Saudi Arabia's King Salman hosted the head of the Lebanese Maronite church, a historic first at a time when Riyadh is stepping up the pressure on Iran-backed Hezbollah. / AFP PHOTO / Fayez Nureldine (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

Lebanon's Christian Maronite patriarch Beshara Rai (L) meets with Saudi Crown Prince Mohammed bin Salman on November 14, 2017, in Riyadh.
Saudi Arabia's King Salman hosted the head of the Lebanese Maronite church, a historic first at a time when Riyadh is stepping up the pressure on Iran-backed Hezbollah. / AFP PHOTO / Fayez Nureldine        (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

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Saudi Crown Prince and Defence Minister Mohammed bin Salman arrives to attend the first meeting of the defence ministers and officials of the 41-member Saudi-led Muslim counter-terrorism alliance in the capital Riyadh on November 26, 2017. This is the first official meeting of the 41-member Islamic Military Counter Terrorism Coalition, first formed in 2015 under the auspices of Prince Mohammed -- whose rapid ascent since his appointment as heir to the throne in June has shaken the regional political scene. / AFP PHOTO / Fayez Nureldine (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

Saudi Crown Prince and Defence Minister Mohammed bin Salman arrives to attend the first meeting of the defence ministers and officials of the 41-member Saudi-led Muslim counter-terrorism alliance in the capital Riyadh on November 26, 2017.
This is the first official meeting of the 41-member Islamic Military Counter Terrorism Coalition, first formed in 2015 under the auspices of Prince Mohammed -- whose rapid ascent since his appointment as heir to the throne in June has shaken the regional political scene.  / AFP PHOTO / Fayez Nureldine        (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

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(COMBO) This combination of pictures created on September 9, 2017 shows then-Saudi Defence Minister and Deputy Crown Prince Mohammed bin Salman (L) during a press conference in the capital Riyadh on April 25, 2016; and Qatar's Emir Sheikh Tamim bin Hamad Al-Thani (R) attending the 136th Gulf Cooperation Council (GCC) summit in Riyadh on December 10, 2015. The Qatari ruler called Saudi Crown Prince Mohammed bin Salman to express interest in talks to resolve a three-month-old diplomatic crisis, Saudi state media said early on September 9, 2017. The crown prince 'welcomed this desire,' the Saudi Press Agency (SPA) reported, adding 'details will be announced after Saudi Arabia reaches an agreement with UAE and Bahrain and Egypt', the Arab bloc that cut ties with Qatar in June. / AFP PHOTO / FAYEZ NURELDINE (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

(COMBO) This combination of pictures created on September 9, 2017 shows then-Saudi Defence Minister and Deputy Crown Prince Mohammed bin Salman (L) during a press conference in the capital Riyadh on April 25, 2016; and Qatar's Emir Sheikh Tamim bin Hamad Al-Thani (R) attending the 136th Gulf Cooperation Council (GCC) summit in Riyadh on December 10, 2015.
The Qatari ruler called Saudi Crown Prince Mohammed bin Salman to express interest in talks to resolve a three-month-old diplomatic crisis, Saudi state media said early on September 9, 2017.
The crown prince 'welcomed this desire,' the Saudi Press Agency (SPA) reported, adding 'details will be announced after Saudi Arabia reaches an agreement with UAE and Bahrain and Egypt', the Arab bloc that cut ties with Qatar in June. / AFP PHOTO / FAYEZ NURELDINE        (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

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Saudi Crown Prince and Defence Minister Mohammed bin Salman arrives to attend the first meeting of the defence ministers and officials of the 41-member Saudi-led Muslim counter-terrorism alliance in the capital Riyadh on November 26, 2017. This is the first official meeting of the 41-member Islamic Military Counter Terrorism Coalition, first formed in 2015 under the auspices of Prince Mohammed -- whose rapid ascent since his appointment as heir to the throne in June has shaken the regional political scene. / AFP PHOTO / Fayez Nureldine (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)

Saudi Crown Prince and Defence Minister Mohammed bin Salman arrives to attend the first meeting of the defence ministers and officials of the 41-member Saudi-led Muslim counter-terrorism alliance in the capital Riyadh on November 26, 2017.
This is the first official meeting of the 41-member Islamic Military Counter Terrorism Coalition, first formed in 2015 under the auspices of Prince Mohammed -- whose rapid ascent since his appointment as heir to the throne in June has shaken the regional political scene.  / AFP PHOTO / Fayez Nureldine        (Photo credit should read FAYEZ NURELDINE/AFP/Getty Images)