The amendment of the Constitution may only be executed in the form of a constitutional statute whose draft may be submitted by the President, the Senate or a group of no less than one-fifth of the statutory composition of the Sejm (i.e. 92 Deputies). A statute to amend the Constitution has to be adopted by the Sejm by a majority of at last two-thirds of votes in the presence of at least half of the statutory number of Deputies. Subsequently, within a period of no more than 60 days, the same wording of the law has to be adopted by the Senate by an absolute majority vote in the presence of at least half of the statutory number of Senators. If the proposed amendment to the Constitution relates to Chapter I (The Republic), Chapter II (The freedoms, rights and obligations of persons and citizens) or XII (Amending the Constitution), the subjects entitled to initiate changes to the Constitution may require, within 45 days of the adoption of the statute by the Senate, the holding of a confirmatory referendum. The amendment to the Constitution is deemed accepted if the majority of the voters express support. The President signs the adopted statute within 21 days of its submission by the Marshal of the Sejm and orders its promulgation in the Journal of Laws. The President may not exercise his right to veto. Additionally, the Constitution may not be changed during a period of extraordinary measures.