The Tanaiste has insisted that no State bodies were authorised to carry out surveillance on the headquarters of the Garda Síochána Ombudsman Commission (GSOC).
Eamon Gilmore says he is confident that any potential surveillance on the Commission headquarters was not carried out by an agency of the State.
In the Dáil the opposition parties demanded an assurance that the State itself had put GSOC under surveillance.
The Tanaiste appeared to be dodging the question, but eventually gave TDs a firm assurance.
Meanwhile the Tanaiste earlier said the Justice Minister Alan Shatter "is willing" to attend the Oireachtas Committee on Public Service Oversight to answer questions about the GSOC affair.
The Committee is also looking to have the full report into the possible bugging of the GSOC HQ by security company 'Verrimus' made available to it.
GSOC Chairman Simon O'Brien told the Committee yesterday that he suspected the office had been under surveillance.
Minister Shatter has already said there is no evidence of surveillance and has rejected calls for an independent inquiry.
Chairman of the Oireachtas Committee, Padraig MacLochlainn of Sinn Féin, said TDs have "grave concerns" following the evidence yesterday.
