The House of Representatives has summoned heads of four government agencies to appear before it.
The agencies include the Central Bank of Nigeria (CBN), Nigeria National Petroleum Coperation (NNPC), Department of State Services (DSS) and the Nigerian Customs.
The decision followed a resolution by the House Committee in charge of these agencies.
Addressing newsmen on Thursday, in Abuja, Chairman of the Committee, Hon. Yusuf Buba, said the agencies are to appear before the House on Monday, August 19, 2019.
According to him, the Committee resolved to take the action as the Chief Executives failed to honour the invitation to appear before it for an investigative public hearing.
The public hearing was on the need to determine why the Warri, Port Harcourt, Calabar, Onne and Onitsha inland complexes are not being put into maximum use.
Buba said it was an important matter and that the Committee would not let any individual or group treat it with levity.
He said the lawmakers were determined to get to the root of the matter and ensure the ports operated to full capacity.