(L-R) Nigeria's President Muhammadu Buhari, Seychelles' President Danny Faure, Sierra Leone's President Julius Maada Bio, Britain's Prime Minister Theresa May and Commonwealth Secretary-General Patricia Scotland arrive at Windsor Castle for a  Commonwealth Heads of Government meeting (CHOGM) retreat in Windsor, west of London on April 20, 2018. (Photo by Jack Taylor / POOL / AFP)        (Photo credit should read JACK TAYLOR/AFP/Getty Images)