The Fianna Fáil leader Micheál Martin says the Justice Minister Alan Shatter has tried to "undermine" GSOC from the outset of the bugging controversy.
Mr Martin says Mr Shatter's conduct has been "appalling" since the claims of surveillance first arose last week.
The Minister is due to appear before the Public Service Oversight committee, a day after he announced a former High Court judge would lead a review into the matter.
The Fianna Fáil leader says that inquiry does not go far enough and that Mr Shatter has more questions to answer over his own conduct:
The Minister for Justice Alan Shatter has said he received a report stating there is "no evidence at all" of bugging at the offices of the Garda Ombudsman Commission.
Shatter said a report from an IT security firm in Dublin noted that there is not only no conclusive evidence of bugging, but rather no evidence at all.
In a half-hour speech to the Dáil last night the minister added he had commissioned a report from RITS, an IT security firm based in Citywest.
RITS had reviewed the claims made in the report by Verrimus, the British firm hired by GSOC to investigate the possibility of bugging.
The minister said the report from RITS was emphatic in ruling out any bugging.
He also confirmed some details of a newspaper report, which explained that a WiFi device in GSOC's boardroom was connecting to a network in a nearby coffee shop.
He was not aware of that information last week and had only been told on Friday.