The Justice Minister says Alan Shatter has every right to make whatever contributions he wants to on the Guerin Report - but that the coalition stands by the inquiry.

Yesterday Deputy Shatter launched a scathing attack on the barrister whose report led to his resignation, comparing it to a 'Kangaroo Court'.

Senior Counsel Seán Guerin examined the claims of whistleblower Garda Sergeant Maurice McCabe.

The former Justice Minister says he was denied natural justice by not being interviewed and accused Mr. Guerin of "rushing to judgement".

Minister Frances Fitzgerald has ruled out any further inquiry, saying the claims have been independently investigated, GSOC security has been reinforced and relevant laws are being clarified and strengthened.

She says the government has accepted the Guerin Report and is establishing a commission of investigation as a result.