The initiative for amending the Constitution shall belong both to the President of the Republic and to the Deputies. The Prime Minister may propose an amendment of the Constitution to the President of the Republic. The bill or proposition of amendment of the Constitution must be adopted by the National Assembly. The amended Constitution shall be final after its approval by referendum. However, the bill of amendment shall not be presented to a referendum whenever the President of the Republic decides to submit it to the National Assembly alone; in this case the bill of amendment shall be approved only if it receives a majority of three-fifths of the members of the National Assembly. The republican form of the state may not be made the subject of an amendment.