Akpabio said he remains committed to producing a regional road map for development of the Niger Delta.
Some of the directors of NDDC were interrogated at the Commission’s headquarters.
The Commission said it released the list to expose committee chairmen in the National Assembly.
The delay, it was revealed, was caused by the sudden death of the then EDFA of the commission.
The recommendation of the committee was presented on the floor of the senate by its Chairman.
Akpabio claimed he did not refer to members of the national assembly in his comments.
The House of Reps will be suing Akpabio for perjury and defamation.
NDDC said he was ill for two weeks, as his doctors advised him to stay clear from the probe.
The Deputy Chairman of the committee will now take over as the head of the probe panel.
Buhari called on investigating agencies and audit firms working with the National Assembly to act.