Simon Harris says accusations he leaked information from Cabinet were an abuse of Dail privilege.
Sinn Fein TD Matt Carthy made the claim in the Dail during an unsuccessful no confidence vote in Foreign Affairs Minister Simon Coveney.
Deputy Carthy accused the higher education minister of leaking confidential government details.
Simon Harris says the claims are untrue.
"Deputy Carthy has now asserted on the national airwaves, that he stood up in Dáil Eireann yesterday without any evidence whatsoever," he said.
"Without talking to his party leader, without talking to the Taoiseach or the Tánaiste, without any evidence and made comments that I think if they were said outside of here would be defamatory.
"Whay deputy Carthy did yesterday was a misuse of Dáil privilege."
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