The Superior Chamber of Mexico's Electoral Tribunal of the Federal Judiciary (TEPJF) upheld the National Electoral Institute's (INE) decision to reject an investigation into the so-called "operation acordeón," which allegedly involved the Mexico City government and the Morena party distributing voting guides during the judicial election. The tribunal ruled this decision was based on insufficient evidence to warrant an inquiry. The TEPJF magistrates, some aligned with the ruling party, validated the INE's refusal to open an investigation into the preparation and distribution of these materials. Several non-governmental organizations have accused the TEPJF of delaying or withholding the review of appeals related to the judicial election results, arguing that the tribunal cannot be impartial in selecting its own members for the Supreme Court of Justice of the Nation (SCJN). Meanwhile, the INE has delivered majority certificates for the judicial election, resulting in the SCJN having, for the first time, a fully elected membership by popular vote. Additionally, there are allegations that TEPJF magistrate Alfredo Fuentes Becerra is improperly holding an appeal file that should be with the Supreme Court. The controversy around the use of "acordeones" and the tribunal's handling of the election challenges has sparked public debate and criticism.