The electoral reform proposed by Claudia Sheinbaum was dismissed in the Chamber of Deputies on March 11, following a vote where the ruling party, Morena, managed to secure 259 votes in favor versus 234 against. Despite obtaining a majority, the proposal did not pass as it required a two-thirds majority to be considered qualified. Significant opposition came from the PT (Worker's Party) and the Green Party, which both announced their opposition ahead of the vote due to specific disagreements regarding issues like changes to the election process for proportional representation deputies and amendments to the Preliminary Electoral Results Program (PREP), which provides immediate election results through the National Electoral Institute (INE).