Saudi Arabia's King Salman bin Abdulaziz Al Saud welcomes Philippine President Rodrigo Duterte during a reception ceremony in Riyadh, Saudi Arabia, April 11, 2017.

Saudi Deputy Crown Prince Mohammed bin Salman meets with Philippine President Rodrigo Duterte in Riyadh, Saudi Arabia, April 11, 2017.

Saudi Arabia's King Salman bin Abdulaziz Al Saud and Philippine President Rodrigo Duterte review the honor guards during a reception ceremony in Riyadh, Saudi Arabia, April 11, 2017.

Saudi Deputy Crown Prince Mohammed bin Salman speaks with Philippine President Rodrigo Duterte during their meeting in Riyadh, Saudi Arabia, April 11, 2017.

Philippine President Rodrigo Duterte speaks during a meeting with the Filipino community in Riyadh, Saudi Arabia, April 12, 2017.

Saudi Arabia's King Salman bin Abdulaziz Al Saud welcomes Philippine President Rodrigo Duterte during a reception ceremony in Riyadh, Saudi Arabia, April 11, 2017.

Members of the Filipino community attend a meeting with Philippine President Rodrigo Duterte in Riyadh, Saudi Arabia, April 12, 2017.

Saudi Arabia's King Salman bin Abdulaziz Al Saud and Philippine President Rodrigo Duterte review the honor guards during a reception ceremony in Riyadh, Saudi Arabia, April 11, 2017.

Saudi Deputy Crown Prince Mohammed bin Salman waves as he meets with Philippine President Rodrigo Duterte in Riyadh, Saudi Arabia, April 11, 2017. Bandar Algaloud/Courtesy of Saudi Royal Court/Handout via REUTERS

Saudi Arabia's King Salman bin Abdulaziz Al Saud welcomes Philippine President Rodrigo Duterte during a reception ceremony in Riyadh, Saudi Arabia, April 11, 2017.