(FILES) This file photo taken on July 31, 2016 shows an opposition supporter holding up a reading "Long live the opposition" during a rally organised by political opposition parties in Kinshasa. Business slowed in Democratic Republic of Congo's capital on August 23, 2016 after the opposition called for a national strike to demand President Joseph Kabila end his 15-year rule when his mandate runs out in December. / AFP PHOTO / Eduardo SoterasEDUARDO SOTERAS/AFP/Getty Images