The widow of a former TD, the late Liam Lawlor, will ask the High Court on Monday to stop the opening of the Mahon Tribunal's investigation into the rezoning of lands at Quarryvale West in Dublin.
Lawyers for Hazel Lawlor were given permission by the court today to make the application.
The Taoiseach, Bertie Ahern, is one of the witnesses due to give evidence in the Quarryvale Two module. It was due to begin on 30 April.
Mrs Lawlor wants a stay on the Quarryvale Two module beginning, pending her legal challenge to the tribunal.
She says if she is not given the stay damage could be done to her late husband, his estate, and to her and to their family that could not be repaired later.
The court heard the tribunal is due to issue an updated opening statement on 30 April.
Developer Tom Gilmartin is then due to take the stand, followed by Frank Dunlop and Mr Ahern.
Mr Justice Iarfhlaith O'Neill said it was clearly a matter of urgency and he told both sides to be ready for the matter to be heard next Monday.