The green-chaired members of parliament are asking questions and the Minister of Finance, Kemi Adeosun has said she does not have access to such facts.

The problem - procurement of pre-shipment inspection contracts by some firms, who allegedly forged tax certificates.

The lawmakers have threatened to handover such defaulters to anti-graft agencies for prosecution.

The Chairman House Committee on Public Procurement, Oluwole Oke says the lower chamber will be forced to invite all permanent secretaries of finance ministry from 1999 to date to explain the discrepancies.

Specifically, the former ministers under the past administration of Goodluck Jonathan would also be invited to answer more specific questions related to cases of suspected fraud.

The ex-ministers include - Ngozi Okonjo-Iweala and Nenadi Usman, former Head of Service of the Federation, Steve Oronsaye; former Accountant General of the Federation, Jonah Otunla.

“They are to come and defend themselves and let us know the various roles they played within the period of their stewardship. The essence of this invitation is to enable the investigative hearing have a balance position on all issues,” Oke said.