Three pro-life members of the committee on the 8th amendment say they will issue their own report on the process.
The Committee this evening began the work of finalising its report for the Oireachtas.
Senator Ronan Mullen, Deputy Peter Fitzpatrick and Deputy Mattie McGrath say the process was flawed and has arrived at what they call "cruel and unjust recommendations".
"This Committee in no way subjected the recommendations of the Citizens Assembly to anything resembling critical scrutiny. The fact that it endorsed the vast majority of Citizens Assembly recommendations illustrates how little critical and independent thinking took place in the Committee.
"We will not be party to any report or recommendations that attempt to lend parliamentary legitimacy to the destruction of unborn human life and to interventions at odds with best medical practice in the protection of women and their unborn children, their life and their health.
"In the light of our decision we will issue our own joint assessment early next week," their statement said.