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RIYADH, SAUDI ARABIA - MAY 21: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----)US President Donald Trump (2nd L), US First lady Melania Trump (L), Saudi Arabia's King Salman bin Abdulaziz al-Saud (3rd L) listen a briefing during the inauguration ceremony of the Global Center for Combating Extremist Ideology in Riyadh, Saudi Arabia on May 21, 2017. (Photo by Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

RIYADH, SAUDI ARABIA - MAY 21: (----EDITORIAL USE ONLY  MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----)US President Donald Trump (2nd L), US First lady Melania Trump (L), Saudi Arabia's King Salman bin Abdulaziz al-Saud (3rd L) listen a briefing during the inauguration ceremony of the Global Center for Combating Extremist Ideology in Riyadh, Saudi Arabia on May 21, 2017. (Photo by Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

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Saudi Arabia's King Salman bin Abdulaziz al-Saud (2nd R), US President Donald Trump (2nd L) and US First Lady Melania Trump (L) look at a display of Saudi modern art at the Saudi Royal Court in Riyadh on May 20, 2017. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

Saudi Arabia's King Salman bin Abdulaziz al-Saud (2nd R), US President Donald Trump (2nd L) and US First Lady Melania Trump (L) look at a display of Saudi modern art at the Saudi Royal Court in Riyadh on May 20, 2017. / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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RIYADH, SAUDI ARABIA - MAY 20: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump (R) and Saudi Arabia's King Salman bin Abdulaziz Al Saud (L) walk past hnor guard during official welcome ceremony piror to their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia on May 20, 2017. (Photo by Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

RIYADH, SAUDI ARABIA - MAY 20:  (----EDITORIAL USE ONLY  MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump (R) and Saudi Arabia's King Salman bin Abdulaziz Al Saud (L) walk past hnor guard during official welcome ceremony piror to their meeting at Al-Yamamah Palace in Riyadh, Saudi Arabia on May 20, 2017. (Photo by Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

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RIYADH, SAUDI ARABIA - MAY 21: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----)US President Donald Trump, US First lady Melania Trump (2nd R), Saudi Arabia's King Salman bin Abdulaziz al-Saud (2nd L) and Egyptian President Abdel Fattah el-Sisi (L) put their hands on an illuminated globe during the inauguration ceremony of the Global Center for Combating Extremist Ideology in Riyadh, Saudi Arabia on May 21, 2017. (Photo by Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

RIYADH, SAUDI ARABIA - MAY 21: (----EDITORIAL USE ONLY  MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI ROYAL COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----)US President Donald Trump, US First lady Melania Trump (2nd R), Saudi Arabia's King Salman bin Abdulaziz al-Saud (2nd L) and Egyptian President Abdel Fattah el-Sisi (L) put their hands on an illuminated globe  during the inauguration ceremony of the Global Center for Combating Extremist Ideology in Riyadh, Saudi Arabia on May 21, 2017. (Photo by Bandar Algaloud / Saudi Royal Council / Handout/Anadolu Agency/Getty Images)

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US President Donald Trump (2nd-L) and First Lady Melania Trump (C) take part in a welcome ceremony by Saudi King Salman bin Abdulaziz al-Saud (3rd-R) upon arrival at King Khalid International Airport in Riyadh on May 20, 2017, accompanied Prince Khaled bin Salman (3rd-L). / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US President Donald Trump (2nd-L) and First Lady Melania Trump (C) take part in a welcome ceremony by Saudi King Salman bin Abdulaziz al-Saud (3rd-R) upon arrival at King Khalid International Airport in Riyadh on May 20, 2017, accompanied Prince Khaled bin Salman (3rd-L). / AFP PHOTO / MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)