When the seat of a deputy in the Assembly is vacant, it is filled by a new member.
When the mandate of a deputy elected from the multi-name list of an electoral subject ends prematurely, his seat is filled by the next candidate on the list.
When the mandate of a deputy elected in a single-member zone ends prematurely, his seat is filled by the next candidate in the multi-name list of the respective electoral subject. If the mandate of an independent deputy ends prematurely, the vacancy is filled by a new deputy elected by the voters of the same electoral zone. In any case, the President of the Republic, on the basis of immediate notification by the Speaker of the Assembly, sets by decree a date for partial elections in that zone, no later than 45 days from the receipt of the notification. The deputy elected to fill a vacant seat serves until the end of the mandate of the deputy who left.
When the seat of a mayor of a municipality or commune is vacant, the Council of Ministers informs the President of the Republic within two weeks. The President of the Republic sets the date of partial elections for the election of a new mayor of the municipality or commune within 45 days from the date of notification. When the seat of a council member in the municipality or commune becomes vacant, it is filled by the next candidate of the respective multi-name list.
If the seat of a mayor of a municipality or commune becomes vacant during the last 6 months of his mandate, the respective council elects from among its members a new mayor to serve until the end of the mandate.
Partial elections are held according to the same procedure as general elections.
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The VOTA database was created within the framework of the joint programme between the Venice Commission and the European Commission "Democracy through free and fair elections". It is managed jointly by the Secretariat of the Venice Commission and by the Mexican Electoral Tribunal of the Federal Judiciary (TEPJF).