Former minister for justice Alan Shatter has begun a High Court challenge aimed at quashing some of the findings of the Guerin Report.
Mr Shatter wants to quash findings concerning his handling of claims by garda whistleblower Maurice McCabe.
Mr Shatter alleges objective bias and an absence of fair procedures on the part of Senior Counsel Sean Guerin in the way in which he compiled his report and reached conclusions critical of the minister.
The former minister claims Mr Guerin should have interviewed him before reaching conclusions on a range of issues.
He said this was very important given that the conclusions had gravely affected his career and reputation.
If he had been interviewed, Mr Shatter said that would have shown he had not deferred to former garda commissioner Martin Callinan's view concerning Sergeant McCabe's allegations.
He said Mr Guerin should have taken additional time necessary for the report.
The court was told that haste in concluding the report led to errors.
Mr Shatter was given permission to bring judicial review proceedings against Mr Guerin by the High Court.
Meanwhile, Minister for Foreign Affairs Charlie Flanagan has said Mr Shatter was perfectly within his rights to bring a High Court challenge as he is an interested party in the report.
He said it was open to any citizen to bring such a challenge.