Article 87 Political Constitution of the United Mexican States
Third Title · Chapter III. On the Executive Power
Current text · last reform published in the Official Gazette of the Federation (DOF) on 2 June 2026
The President, upon taking possession of his office, shall take before the Congress of the Union or before the Permanent Commission, during the recesses of the former, the following oath: "I swear to keep and to cause to be kept the Political Constitution of the United Mexican States and the laws that emanate from it, and to perform loyally and patriotically the office of President of the Republic that the people have conferred on me, looking in everything to the good and prosperity of the Union; and if I do not do so, may the Nation demand it of me."
If for any circumstance the President cannot take the oath in the terms of the preceding paragraph, he shall do so immediately before the Boards of Directors of the Chambers of the Congress of the Union.
In case the President cannot take the oath before the Congress of the Union, before the Permanent Commission or before the Boards of Directors of the Chambers of the Congress of the Union, he shall do so immediately before the President of the Supreme Court of Justice of the Nation.