Green Party TD Neasa Hourigan has said she will break ranks with the Government and vote in favour of a Sinn Fein motion on the new National Maternity Hospital on Wednesday night.
Ms Hourigan said she expects that she will face repercussions but she is voting in favour of the Sinn Fein motion to "register" her objection to the deal which has been approved by Cabinet.
In a statement to the Irish Mirror, she said: "I have to vote in a way that does justice to my own politics, my constituents and the stated policy of the Green Party.