Campaigns for February's general election in Nigeria enter a critical stage with vice presidential candidates taking part in a debate at 18:00 GMT.
Five candidates are expected to participate but the focus will be on Vice-President Yemi Osinbajo of the ruling All Progressives Congress (APC) party and Peter Obi from the main opposition People's Democratic Party (PDP).
The two politicians are formidable opponents. Both of them have been in government at different levels.
Mr Osinbajo, a law professor, was a former commissioner of justice in south-west Lagos state before becoming vice-president in 2015.
Mr Obi is an economist and was the governor of south-eastern Anambra state for eight years.
Both men are expected to tell Nigerians how they would help their principals steer the ship of state and address the myriads of problems facing the country: from a struggling economy to insecurity.