 Sinn Féin MPs refused to attend Westminster, and instead assembled at the Mansion House in Dublin as a revolutionary parliament called Dáil Éireann, though Hunter could not attend as he was still in prison for his supposed involvement in The German Plot.In May 1921, Hunter was elected unopposed as a Sinn Féin Teachta Dála (TD) for the Cork East and North East constituency at the 1921 elections.During Dáil debates on the Anglo-Irish Treaty, Hunter spoke (albeit briefly) against the treaty.