The Jobs Minister and the Fianna Fáil leader are facing each other tonight, in an RTE Prime Time TV debate on the Seanad referendum.
Richard Bruton and Micheál Martin have clashed on reforming politics, and whether the upper house is democratic.
Voters will go to the polls on the issue on Friday.
In tonight's debate, the most heated discussion was what was in Fianna Fáil's manifesto at the last election:
