U.S. President Donald Trump has coffee during a reception ceremony in Riyadh, Saudi Arabia, May 20, 2017.Bandar Algaloud/Courtesy of Saudi Royal Court/Handout via REUTERS

White House senior advisor Jared Kushner arrives to join U.S. President Donald Trump and the rest of the U.S. delegation to meet with Saudi Arabia's King Salman bin Abdulaziz Al Saud at the Royal Court in Riyadh, Saudi Arabia May 20, 2017.

Saudi Arabia's King Salman bin Abdulaziz Al Saud (R) and U.S. President Donald Trump (L) react to applause after signing a joint security agreement at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Saudi Arabia's King Salman bin Abdulaziz Al Saud (R) and U.S. President Donald Trump sign a joint security agreement at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

U.S. President Donald Trump (2nd L) and his delegation, including Secretary of State Rex Tillerson (L) and Commerce Secretary Wilbur Ross (3rd L), sit down to meet with Saudi Arabia's King Salman bin Abdulaziz Al Saud and the Saudi delegation at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Saudi Arabia's King Salman bin Abdulaziz Al Saud (R) welcomes U.S. President Donald Trump at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

White House senior advisor Jared Kushner (C) arrives to join U.S. President Donald Trump and the rest of the U.S. delegation to meet with Saudi Arabia's King Salman bin Abdulaziz Al Saud at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

U.S. President Donald Trump (C) adjusts the Collar of Abdulaziz Al Saud Medal, after it was bestowed upon him by Saudi Arabia's King Salman bin Abdulaziz Al Saud (not pictured) at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Saudi Arabia's King Salman bin Abdulaziz Al Saud (R at table) and U.S. President Donald Trump (L at table) sign a joint security agreement at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Saudi Arabia's King Salman bin Abdulaziz Al Saud (L, in brown) and U.S. President Donald Trump (C) arrive for their bilateral meeting at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

White House senior advisor Jared Kushner (C) sits alongside U.S. President Donald Trump (L), Commerce Secretary Wilbur Ross (2nd L) and chief economic advisor Gary Cohn (R) as they prepare to meet with Saudi Arabia's King Salman bin Abdulaziz Al Saud and the Saudi delegation at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

White House senior advisor Jared Kushner (C) drinks ceremonial coffee during an official welcome for U.S. President Donald Trump and his delegation by Saudi Arabia's King Salman bin Abdulaziz Al Saud (not pictured) at his Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Lockheed Martin Chairman and CEO Marillyn Hewson (L) exchanges agreements with a Saudi official after a signing ceremony between Saudi Arabia's King Salman bin Abdulaziz Al Saud and U.S. President Donald Trump at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Aides collect folders signifying signed agreements between the Saudi government and U.S. companies after a signing ceremony with Saudi Arabia's King Salman bin Abdulaziz Al Saud and U.S. President Donald Trump at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Saudi Arabia's King Salman bin Abdulaziz Al Saud (R) welcomes U.S. President Donald Trump (L) with coffee in the Royal Terminal after he arrived aboard Air Force One at King Khalid International Airport in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

Saudi Arabia's King Salman bin Abdulaziz Al Saud (C) welcomes U.S. President Donald Trump (2nd L) with a coffee ceremony in the Royal Terminal after he arrived aboard Air Force One at King Khalid Airport International in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst

After a signing ceremony with a raft of agreements between U.S. companies and the Saudi government, U.S. President Donald Trump (4th R) looks over at the lineup of U.S. business chiefs on hand as he exits with Saudi Arabia's King Salman bin Abdulaziz Al Saud (2nd R) at the Royal Court in Riyadh, Saudi Arabia May 20, 2017. REUTERS/Jonathan Ernst