The government has named the day for the Longford-Westmeath and Dublin-West by-elections.
Voters in the two constituencies will go to the polls on May 23rd - the same day as the local and European elections.
The seats are vacant following the death of Nicky McFadden in March. While the seat in Dublin-West is vacant after the resignation of Patrick Nulty.
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Government Chief Whip Paul Kehoe says it is right to hold these by-elections now.