The PDP alleged that the funds used in the 2015 election for Buhari were "proceeds of corrupt activities" of known APC governors and leaders.
The party said the President's anti-corruption war failed on arrival because he lacks the moral right to fight it as he is allegedly a "beneficiary of the corruption freebies" himself.
The opposition party said this in a statement issued on Saturday, March 31, 2018, by its spokesman Kola Ologbondiyan.
He alleged that the funds used in the 2015 election for Buhari were "proceeds of corrupt activities" of known All Progressives Congress (APC) governors and leaders.
"We challenge Buhari to make open the sources of fund available to his campaign in the 2003, 2007 and 2011 race as well as the names of the donors," the statement said.
"We are particularly interested in the fund allegedly provided by a south-south governor for the 2011 presidential election as well as how the cost of litigation was paid by then Buhari campaign.
"President Buhari and his party leaders have huge confessions to make on how they raked in state stolen resources to prosecute elections of 2015. If the federal government and the APC are serious about fighting corruption and not just out to persecute PDP members, they should have began with the probe into the source of the billions of naira used for President Buhari’s 2015 presidential campaigns, particularly in the face of allegations that the fund was looted from treasuries of various APC states.
"The PDP ask can president Buhari in all honesty claim ignorance of reports in the open media that a South-south governor looted several billions from his state accounts and diverted the sums into Buhari’s 2015 campaigns?
"Can the presidency and the APC inform Nigerians what steps the federal government has taken to investigate this allegation, which has been in public domain and to clarify their roles as beneficiaries of the alleged looted funds?" Ologbondiyan added.
The opposition party is reacting to the list of alleged treasury looters, who are mostly PDP members, released by the Federal Government.
The PDP spokesman also challenged Buhari to tell Nigerians what he has done about the alleged stealing of N1.1 trillion worth of crude oil under his watch as minister of petroleum.
He further said, "The presidency should tell Nigerians what has been done to recover the stolen N18 billion internally displaced persons (IDPs) intervention fund and the N10 billion National Health Insurance Scheme (NHIS) fund alleged to have been stolen from the treasury single account (TSA) by APC officials and presidency cabal.
"The Buhari presidency must immediately explain why it has been providing cover for the cabinet minister reported to have bought a property worth N280 million in Abuja from corrupt enrichment.
"How can a President who enjoys the company of perjurer, looters and is never aware of the activities of corrupt people around him, fight the menace of corruption?"
On Friday, March 30, 2018, the Minister of Information, Lai Mohammed released a list of some of those who have allegedly looted the nation's treasury.
PDP chieftains who are currently being tried for corruption and financial crimes.
Some of them are the current PDP National Chairman, Uche Secondus, Former Financial Secretary of the party, former National Publicity Secretary of the party, Olisa Metuh, a chieftain of the party Dr Raymond Dokpesi, AIT founder, among others.