Atiku Abubakar, his main challenger, trailed with 11,262,978 votes.
Yakubu announced that a certificate of return will be issued to Buhari and Vice-President Yemi Osinbajo at the International Conference Center (ICC).
Atiku’s Peoples Democratic Party (PDP) has rejected the result, citing irregularities. Buhari won in 19 states, while Atiku emerged victorious in 17 states and the federal capital territory (FCT).
In 2015, Buhari scored 15, 424,921 votes to beat Goodluck Jonatha, the incumbent president, who scored 12,853,162 votes.
Below is a table on how Buhari and Atiku fared across the country: