The Fianna Fáil leader, Micheál Martin, accused the Minister for Justice of misleading the Dáil in relation to Garda whistleblower Maurice McCabe.
Micheál Martin yesterday revealed he obtained documents after meeting Sergeant McCabe which contain evidence alleging Gardaí failed to properly investigate serious crimes.
This morning, Deputy Martin says he believes Minister Alan Shatter's position is untenable.
He is slamming Mr Shatter's treatment of Maurice McCabe, and his comments about him in the Dáil.
"He sought to be too dismissive of the whistleblower, he essentially rubbished him in the Dáil by saying he didn't cooperate with Sergeant John O'Mahony's inquiry into the penalty point saga - we now know he was never interviewed by that inquiry."
When asked directly if he was alleging that Shatter misled the Dáil in relation to McCabe, he replied "yes … by implying that McCabe didn't cooperate."
Meanwhile, Independent TD Mick Wallace defended Oliver Connolly, the confidential information recipient in the Garda Síochána sacked yesterday, and said he believes neither Alan Shatter nor the Garda Commissioner are fit for office.