Lucinda Creighton says the Reform Alliance has the potential to expand, and has been approached by Independent TDs.
The group of Fine Gael rebels says about 1300 people attended its conference in Dublin on Saturday.
They have previously said they may become a political party in the future but have no plans for it at the moment.
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The group's most prominent TD Lucinda Creighton told Newstalk's Breakfast the Reform Alliance isn't recruiting - but has room to grow in the future:
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