Two major changes occurred in the 1970s regarding constitutional checks and balances. Traditionally, France operated according to parliamentary supremacy: no authority was empowered to rule on whether statutes passed by Parliament respected the constitutional rights of the citizens. In 1971, however, the Constitutional Council, arguing that the preamble of the constitution referenced the rights defined in the 1789 Declaration of the Rights of Man and of the Citizen and the preamble of the 1946 constitution, concluded that statutes must respect these rights and so declared partially unconstitutional a statute because it violated freedom of association. Only the President of the Republic, the Prime Minister, or the president of either house of Parliament could ask for a constitutional review a statute was signed into law—which greatly reduces the likelihood of such a review if all these officeholders happened to be from the same side of politics, which was the case at the time. Then in 1974, a widened this prerogative to 60 members of the National Assembly or 60 members of the senate. From that date, the opposition has been able to have controversial new statutes examined for constitutionality.