He said it would be suicidal in 2019 for Buhari to continue.
The former Speaker of the House of Representatives spoke in Abuja on Monday when the Peace and Reconciliation Committee of the PDP paid him a visit in his Maitama (Abuja) residence.
Tambuwal said he was not angry about his loss of the party’s presidential ticket in Port Harcourt, Rivers State, to a former Vice-President, Atiku Abubakar.
He promised to work with the national leadership of the PDP towards ensuring that the party emerges victorious in the 2019 presidential election.
Tambuwal added, “The maladministration and the way the country is being run through proxies is unacceptable.
“President Buhari is not in charge. It will be suicidal for him to return to power for another four years. So, we don’t want a situation whereby that will continue anytime after May 29, 2019.
“We want a government in which the President of Nigeria will be right on top of issues. One that will respect the rule of law.
“So, I have given my commitment and I mean it, I am out for it. By the grace of God, we shall support Atiku Abubakar and the PDP to win elections throughout Nigeria.”