Labour minister Pat Rabbitte has called for discipline among the Senators in his party who are considering voting against the social welfare bill in the Dail.
At least four Senators have expressed reservations about supporting the bill which begins its passage through the Seanad tomorrow.
Donegal Labour Senator Jimmy Harte says he will be voting in favour of the Bill.
The Coalition has a tight majority in the Seanad, with only 31 of the 60 members.
Communications Minister Pat Rabbitte says dissenting Senstors need to show discipline: