The Seanad Committee on Members' Interests is to seek the approval of the Seanad to challenge the High Court decision in the Ivor Callely case.
Two weeks ago, the High Court overturned the Committee's findings and the decision to suspend Senator Callely from the House last July.
The Court found that the Committee had acted beyond its powers by making a political judgment after an investigation into Senator Callely's claims for expenses.
The Committee found that the Senator had wrongly used his address in Cork to claim expenses.
The case is due to be heard in the High Court on Monday.
