Elections in Africa's most populous nation have for years been marred by allegations of irregularities including vote rigging, voter intimidation, cronyism and violence.
The People's Democratic Party on Thursday accused Buhari and the Independent National Electoral Commission of plotting to rig the election with the appointment of Amina Zakari, whom the party said is Buhari's niece.
In a statement on Thursday, the People's Democratic Party rejected Zakari's appointment as "head of the collation of results," calling her a "blood relation."
A commission spokesperson did not respond to a request for comment.
Buhari, who is seeking a second term, reassured voters in October that the election would be free and fair after international observers raised concerns over how a gubernatorial vote was conducted at the time. (Writing by Didi Akinyelure; Editing by Richard Chang)
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