The director of Labour's campaign to abolish the Seanad has admitted he doesn't know how much the taxpayer will save by scrapping it.
Junior Minister Alex White says Labour's campaign for a Yes vote is more concerned with slimming down the Oireachtas instead of saving money.
Supporters of the Seanad have criticised Fine Gael's claims that scrapping the chamber would save €100m over five years.
Minister White said he's not so clear on the savings.
"I don't know precisely what the saving would be," he said.
"I do believe that the argument is about our democracy generally, our parliament, whether there is a need to have two chambers…
"I think that the issue of cost, when it arises, is not the central argument here."