Dozens of proposed amendments to the Civil Partnership and Certain Rights and Obligations of Cohabitants Bill were due to be discussed.
The Seanad rejected, without a vote, an amendment that would have allowed Registrars opt-out of presiding over civil partnership ceremonies.
The so-called 'conscientious object' amendment had been tabled by Independent Senator Rónán Mullen, however the matter was not put to a vote because not enough Senators called for one.
Senators spent three hours discussing the amendment, in total there were 77 amendments down for discussion.
