On 29 February 2012, Ó Cuív resigned as Fianna Fáil's deputy leader and Communications Spokesperson. He resigned from these positions due to dissatisfaction with his party's position on the Fiscal Compact Referendum. Fianna Fáil leader Micheál Martin stated that Ó Cuív would face expulsion from the parliamentary party if he did not vote with the party on the Fiscal Compact in the Dáil. Coming just a week before their party conference, Ó Cuív's resignation caused a split down the middle of the Fianna Fáil party.