 A court case was begun in the name of Lemass and others.However, the assassination by the IRA of Kevin O'Higgins, the Vice-President of the Executive Council (deputy prime minister), led to the passing of a new Act requiring all prospective Dáil candidates to take an oath that, if elected, they would swear the Oath of Allegiance; a refusal to do so would prohibit anyone from candidacy in a general or by-election.Faced with the threat of legal disqualification from politics, de Valera eventually took the Oath of Allegiance while claiming that he was simply signing a slip of paper to gain a right of participation in the Dáil, not "actually" taking an Oath.