New Zealand First leader Winston Peters' lawyer, Peter Williams, QC, says Parliament's privileges committee is selective in what it is releasing into the public domain.
Mr Williams told Morning Report on Friday that the committee is keen to release statements from businessman Owen Glenn, but has not released a second statement from Mr Peters' other lawyer, Brian Henry.
The privileges committee is considering whether Mr Peters should have declared the $100,000 donation from Mr Glenn towards the cost of an electoral petition in Tauranga after the 2005 election. Mr Peters claimed that National Party MP Bob Clarkson had overspent on his successful campaign.
The committee on Thursday released a second letter from Mr Glenn, reiterating that Winston Peters sought a donation from him. Mr Peters has said he knew nothing of the donation until told by his lawyer in July, and that he never approached Mr Glenn for the money.
Mr Peters appeared before the committee on Thursday, but gave no evidence.
A statement from Mr Williams was tabled at the hearing, after he refused to stay within the scope under which the committee agreed to hear him.
Rodney Hide, who laid the complaint with the committee, says Mr Williams did not seem to understand the way the committee operates.
Mr Williams told Morning Report that Mr Hide was acting in an improper way at the hearing on Thursday, saying he was "jeering and leering".