Article 70 Political Constitution of the United Mexican States
Third Title · Chapter II. On the Legislative Power · Section I. On the Election and Installation of the Congress
Current text · last reform published in the Official Gazette of the Federation (DOF) on 2 June 2026
Every resolution of the Congress shall have the character of law or decree. The laws or decrees shall be communicated to the Executive signed by the presidents of both Chambers and by a secretary of each one of them, and shall be promulgated in this form: "The Congress of the United Mexican States decrees: (text of the law or decree)".
The Congress shall issue the Law that shall regulate its internal structure and functioning.
The law shall determine the forms and procedures for the grouping of the deputies, according to their party affiliation, with the effect of guaranteeing the free expression of the ideological currents represented in the Chamber of Deputies.
This law may not be vetoed nor shall it need promulgation of the Federal Executive to have force.