The President negotiates and ratifies treaties and international agreements (Article 137 of the Constitution). Peace treaties, commercial treaties, treaties relating to international organizations, those that involve state expenditure, those that modify the legislative enactments, those that relate to the status of persons and to human rights, those on the transfer, exchange or addition of territory, may not be ratified except by virtue of law. When the President, the President of the National Assembly or the President of the National Assembly has brought proceedings before the Constitutional Council and it has declared that an international agreement contains a clause that contradicts the Constitution, the authorization to ratify or approve it may only be given when the Constitution has been revised.

When a bill authorizing the ratification of a treaty or the approval of an international agreement, not subject to ratification, is brought before the National Assembly, it is not voted on the articles contained in these acts, and it may not be presented with an amendment. The Assembly concludes with the adoption or rejection of the bill, or with the adjournment of the discussion. The rejection or adjournment of a bill authorizing ratification of a treaty is reasoned.