Article 60 Political Constitution of the United Mexican States

The public body provided for in Article 41 of this Constitution, in accordance with the provisions of the law, shall declare the validity of the elections of deputies and senators in each one of the single-member electoral districts and in each one of the states (federal entities); it shall grant the respective certificates to the slates of candidates that have obtained a majority of votes and shall make the assignment of senators of first minority in accordance with the provisions of Article 56 of this Constitution and of the law. Likewise, it shall make the declaration of validity and the assignment of deputies according to the principle of proportional representation in accordance with Article 54 of this Constitution and the law.

The determinations on the declaration of validity, the granting of the certificates and the assignment of deputies or senators may be challenged before the regional chambers of the Electoral Court of the Federal Judiciary (Tribunal Electoral del Poder Judicial de la Federación), in the terms indicated by the law.

The resolutions of the chambers referred to in the preceding paragraph may be reviewed exclusively by the Superior Chamber of that same Court, through the means of challenge that political parties may file only when by the grievances set forth the result of the election may be modified. The decisions of the Chamber shall be final and unassailable. The law shall establish the requirements, conditions of admissibility and the procedure for this means of challenge.