European Fiscal Compact
He was the Fianna Fáil party whip and Spokesperson on Foreign Affairs and Trade from April 2011 to July 2012. In July 2012, he was appointed as Spokesperson on Constitutional Reform, Arts and Culture, and Defence, while retaining the post of party whip. Ó Fearghaíl sent Éamon Ó Cuív a letter gagging him during the European Fiscal Compact referendum campaign, after Ó Cuív expressed his own opinion of the Compact against the party's wishes.