A tribunal has begun hearing a petition by several opposition candidates in Nigeria to annul Bola Tinubu's victory in February's presidential election.
Peter Obi and Atiku Abubakar are challenging Mr Tinubu's victory on several grounds - including the fact that the Independent National Electoral Commission failed to upload the result on its website portal in real time.
They allege that this was in breach of the Electoral Act, and INEC's promise to ensure transparency.
INEC is defending the case, saying the final result reflected the will of the electorate and delays in uploading the results were caused by technical glitches and a spike in traffic.