Prince Mohammed bin Salman waits for Gulf Arab leaders ahead of the opening of Gulf Cooperation Council summit, in Riyadh, Saudi Arabia, May 14, 2012. Saudi Arabia's second-in-line to the throne, Deputy Crown Prince Mohammed bin Salman, will meet President Donald Trump at the White House in the highest-level visit to Washington by a Saudi royal since November's presidential election. (AP Photo/Hassan Ammar) ** FILE **