FILE PHOTO: Ghanaian President Nana Akufo-Addo, new chairman of the Economic Community of West African States (ECOWAS), speaks to journalists after a consultative meeting in Accra, Ghana September 15, 2020. REUTERS/Francis Kokoroko/File Photo
ACCRA (Reuters) – Ghana’s main opposition party said on Tuesday it would formally challenge the outcome of a presidential election won last month by incumbent Nana Akufo-Addo, a rare move in a country where losing candidates typically concede defeat.