Fianna Fáil members have been told Sinn Féin's attitude to the criminal courts is a sign it is not fit for Government.
The claim has come from the party's justice spokesman Niall Collins, at a pre-election Ard Fheis in Dublin.
The event is Fianna Fáil's last major event before the general election, with Micheal Martin set to address delegates tonight.
This morning Niall Collins has told those delegates that Sinn Fein's response to the conviction of Thomas 'Slab' Murphy should be questioned: “The fact that the Director of Public Prosecutions in a decision upheld by the Supreme Court felt it necessary to provide for a non-jury trial, in the case of a prominent Sinn Féin associate, clearly tells its own story.
“It shows that Sinn Féin has a long way to go till it is a normal political party.”