In another development, President Buhari has told leaders of the All Progressives Congress, APC, to unite to avoid defeat in 2023.
He gave the charge in his hometown of Daura, Katsina State.
The president had received the APC governorship candidate in Katsina State, Dikko Radda and his running mate, Faruk Jobe, at his residence.
The president vowed to ensure free and fair elections in Nigeria in 2023.
He added that the elections in Anambra, Ekiti and Osun were testimonies of his resolution to ensure a free and fair election.