Mr Des O'Malley tonight pledged full co-operation with any inquiry into the 1970 Arms Trial.
Earlier one of the four men accused of illegally importing weapons in the trial called for an investigation into all of the circumstances surrounding the trial.
Former Irish Army Captain James Kelly made the call following an article in today's Irish Timesalleging that Mr Des O'Malley, the Justice Minister of the day, had directed that a file containing the witness's statement should be withheld from the trial.
It was also said that the document involved effectively implicated one of Mr O'Malley's then cabinet colleagues, Defence Minister the late Mr Jim Gibbons, in the arms affair.
The second trial of Mr Charles Haughey and three others, began on October 6th, 1970. The five were acquitted of a conspiracy to illegally import arms.
The Department of Justice has made the signed and sealed certificate of privilege available through the National Archives under the 30-year rule.
Mr Kelly, who has constantly claimed that he was acting at the time of the affair on the instructions of Mr Gibbons, said he was very pleased with the latest revelations.
He urged the appointment of a High Court judge to examine the arms trial, declaring: "It shows there was a conspiracy by the government to convict me and the others.
"They were willing to go to any lengths. The chickens are coming home to roost, and someone will have to take some action."
Mr O'Malley is due to make a statement on the allegation later this evening.
PA