Mustapha made this known in a statement by Mr Lawrence Ojabo, Director of Press at the Office of the Secretary of Government of the Federation (OSGF), on Tuesday in Abuja.
He spoke shortly after receiving a delegation of the Kogi State, All Progressives Congress (APC), including the House Member-Elect representing Lokoja-Kogi, Mr Haruna Isah.
They also presented the INEC certificate of return to the SGF.
He said that the outcome of the recently concluded by-elections in the three states of Kogi, Bauchi and Katsina was a reflection of the pattern and what would be the outcome of the 2019 presidential elections.
“The trend will double and continue into the coming elections.
President Muhammadu Buhari will defeat every opposition candidate in their own states and emerge victorious with a landslide.
“I enjoin you, (members of the party) to remain steadfast and to continue with the victory trend in all coming elections,” he said.
The APC Senator-Elect, Mr Lawan Gumau, who won the Bauchi South Senatorial District by-election, had visited the SGF earlier to rejoice with him.
Mustapha also assured the senator-elect that APC will record more victories across the country in the coming elections.