Labour says United Future leader Peter Dunne has not been vindicated by a Privileges Committee report into the handing over of Parliamentary records to the David Henry inquiry.
The committee on Tuesday issued its report into the unauthorised release of information to the inquiry into the leak of a report on the Government Communications Security Bureau.
The inquiry was given communication records, in particular between Mr Dunne and the journalist who was leaked the report.
The committee said it is unacceptable the inquiry was so readily given that information.
Mr Dunne says the Privileges Committee report justifies his refusal to co-operate with an inquiry, but Labour disagrees.
Grant Robertson MP says the Henry report failed to do the one thing it was asked to do.
New Zealand First leader Winston Peters maintains Mr Dunne is behind the leak.
Mr Peters told Morning Report he believes Mr Dunne is a serial-leaker and the committee's findings do not put Mr Dunne in the clear.