To take a final decision on the execution of international treaties and the statutes approving them. To this end, the government shall submit them to the Court within six days following the adoption of the ratifying statute. Any citizen may intervene to defend or challenge their constitutionality. Should the Court declare them constitutional, the government may proceed to the exchange of notes; in the contrary case they shall not be ratified. When one or several provisions of a multilateral treaty are declared unenforceable by the Constitutional Court, the President of the Republic may declare consent, formulating the pertinent reservation.