The Green Party TD for Dublin Central, Neasa Hourigan, has confirmed to RTÉ News that she will break ranks with the Government and vote in favour of a Sinn Féin motion on the National Maternity Hospital tomorrow night.

The Sinn Féin motion, proposed by its health spokesperson David Cullinane, seeks to oblige the Government to re-engage with the Saint Vincent's Healthcare Group in order to secure the site at Elm Park for State ownership.

Ms Hourigan told RTÉ News: "Although the Sinn Féin motion is not binding, I will be supporting the motion in order to formally register my objection to the National Maternity Hospital proceeding in its current format."

A Green Party spokesperson said they would not make any comment on the issue tonight.

Ms Hourigan added that she did not know what action the party leadership might take against her, saying: "I currently have no intention to leave either the [Green] parliamentary party, or the party, but I understand if action is taken against me to have me removed."

Earlier today, it appeared as if there was not going to be a Dáil vote on the motion, when the Cabinet opted against putting down a counter-motion.

This was on the stated basis that a decision to press ahead with the plan had already been taken by ministers this morning.

Timeline: New National Maternity Hospital saga

However, when the matter came before the Dáil, Tipperary TD Mattie McGrath called a vote on the motion because his Rural Independent Group argues that the National Maternity Hospital should go ahead as a matter of urgency.

Once the vote was called, Ms Hourigan confirmed that she would support the Sinn Féin motion.

Another Green Party TD, Patrick Costello, has expressed concerns about the Government decision on the National Maternity Hospital.

However it is currently unclear how he will vote tomorrow night.

This is not the first time that MsHourigan has faced internal disciplinary measures.

In July 2020, she lost the party whip after voting against the Government in a Dáil vote on tenants rights but later rejoined the Green Party fold.