Joe Biden's trip to Saudi Arabia this week is a diplomatic challenge that comes with a thorny logistics question: Should the U.S. president be photographed meeting, or even shaking hands with, Crown Prince Mohammed bin Salman?
U.S. presidential visits, even with the closest of allies, are often highly choreographed affairs involving weeks of planning around seating arrangements, camera positions and how officials plan to walk into rooms to set up or avoid a handshake.
