The Association of Secondary Teachers of Ireland is the latest Union to come out against the proposals for a new Croke Park Agreement.
It's going to ballot its 18 thousand members and recommend that they reject the new deal.
The union says a more progressive tax system was the best way forward and that employees should not have to face cuts.
This morning - four unions representing 70 thousand nurses, doctors, lower paid civil servants and other workers came together to launch a campaign opposing Croke Park Two.
Derek Mullen is Deputy General Secretary of the Civil and Public Services Union:
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