Barack Obama, Al Sharif Abdullah Bin Al Hussein, Mark Rutte

President Barack Obama, flanked by Jordan’s King Al Sharif Abdullah Bin Al Hussein, left, and Dutch Prime Minister Mark Rutte, gestures as they wait for two more leaders prior to posing for a group photo during the Nuclear Security Summit, Friday, April 1, 2016, in Washington. (AP Photo/Alex Brandon)

President Barack Obama, flanked by Jordan’s King Al Sharif Abdullah Bin Al Hussein, left, and Dutch Prime Minister Mark Rutte, gestures as they wait for two more leaders prior to posing for a group photo during the Nuclear Security Summit, Friday, April 1, 2016, in Washington. (AP Photo/Alex Brandon)