He said the party would continue to keep the President on his toes.
Makarfi said this at a meeting Buhari held with the leadership of the ruling All Progressives Congress and PDP at the Presidential Villa, Abuja.
He said, “Let me seize this opportunity to assure you, and through you, the entire country, that the PDP having assumed the leadership of the opposition in the country, is poised to play its role energetically, vibrantly, but very decently and with all sense of responsibility.
“This we shall do by giving you a good run for your money and constantly keeping you on your toes as we all strive to make this country better.
“We assure you of our cooperation as much as the opposition can possibly give to enable you to give your best in the process navigating the ship of our state into of a better tomorrow.”