Botswana's President Seretse Ian Khama (L) greets supporters as he leaves after a rally in his village Serowe on March 27, 2018, before officially stepping down on March 31 and handing power to his vice-president on April 1. / AFP PHOTO / MONIRUL BHUIYAN (Photo credit should read MONIRUL BHUIYAN/AFP via Getty Images)
