Alan Shatter has launched a blistering attack on the author of the Guerin Report, effectively saying he has been the victim of a 'Kangaroo Court'.

The former Justice Minister has addressed the Dáil for the first time since he resigned on the Cooke Report, which looked into alleged bugging of the Garda Síochána Ombudsman Commission (GSOC).

However he spent most of his speech criticising Senior Counsel Seán Guerin, who examined the claims of whistleblower Garda Sergeant Maurice McCabe.

He accused Mr. Guerin of "rushing to judgement" to get the report out quickly and says the fact he was not interviewed was a breach of his Constitutional right to natural justice.

Deputy Shatter told the Dáil that no-one should be allowed to be "investigator, prosecutor, judge, jury and executioner".

The current Justice Minister Frances Fitzgerald said the claims of bugging led to difficult times for the gardaí and GSOC.

She 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.

Minister Fitzgerald has also called on the opposition to re-visit their criticisms of Alan Shatter.