Article 77 Political Constitution of the United Mexican States
Third Title · Chapter II. On the Legislative Power · Section III. On the Powers of the Congress
Current text · last reform published in the Official Gazette of the Federation (DOF) on 2 June 2026
Each of the Chambers may, without the intervention of the other:
I.Issue economic resolutions relative to its internal regime.
II.Communicate with the co-legislating Chamber and with the Executive of the Union, by means of commissions from its midst.
III.Appoint the employees of its secretariat and make the internal regulation thereof.
IV.Issue a call, within the term of 30 days from the occurrence of the vacancy, for extraordinary elections that must be held within the following 90 days, in order to fill the vacancies of its members referred to in article 63 of this Constitution, in the case of vacancies of deputies and senators of the Congress of the Union by the principle of relative majority, unless the vacancy occurs within the final year of the term of the corresponding legislator.