Banjul (dpa) – Representatives of the Economic Community of West African States (ECOWAS) have failed to convince Gambian President Yahya Jammeh to give up power following his defeat in the December 1 election, president-elect Adama Barrow said. A statement from Barrow’s office late on Friday said Jammeh’s meeting with Nigerian President Muhammadu Buhari, Liberia’s Ellen Johnson…