Garda Keith Harrison has begun a High Court challenge seeking to quash findings made against him in reports from the Disclosures Tribunal.

The Donegal-based garda, who was strongly criticised in the tribunal's interim reports, has brought the action on the grounds of an alleged prior professional involvement between the tribunal chair Mr Justice Peter Charleton and a witness before the tribunal Chief Superintendent Terry McGinn.

The alleged prior engagement related to when the Chief Superintendent was the garda liaison to the Morris Tribunal, which considered allegations about gardaí in Donegal in 2002-05 when Mr Justice Charleton was that tribunal's Senior Counsel.

Solicitors for Garda Harrison say in light of the alleged prior involvement wrote to the tribunal seeking to have the reports about their client set aside.

The tribunal said in a reply that the steps sought on Garda Harrison's behalf "were absurd and repugnant to the duty to the Oireachtas and the people of Ireland".

In his action, Garda Harrison seeks an order from the High Court quashing findings made in the tribunal's second interim report and the findings of the third interim report in so far as it relates to Garda Harrison.

He also seeks orders prohibiting the further publication of the second interim report and the parts of the third interim report that relate to him, and that the judge is precluded from dealing with any other matters relating to Garda Harrison and the tribunal.

He further seeks a declaration that the judge has acted in breach of the garda's rights to natural and constitutional justice and under Article 6 of the European Convention on Human Rights.

Permission to bring the action was granted, on an ex parte basis, by Mr Justice Seamus Noonan, at today’s sitting of the High Court.

The judge said he was satisfied that arguable grounds had been raised to allow Garda Harrison bring the action had been raised.

The case will return before the courts in two weeks' time.