The political party PT initially appeared to enthusiastically support the electoral 'Plan B' but soon encountered significant internal dissent. Notably, Benjamín Robles Montoya, a key figure in the party, was dispatched to negotiate with senators due to the rising concerns. This meeting, which included other party leaders, highlighted the division within the PT regarding their stance on the electoral reforms.

During the discussions, Robles and Alberto Anaya, the long-standing leader of the PT, addressed their grievances with Ignacio Mier, the head of the legislative group in the Senate. The lack of consensus became evident as Manuel Velasco, the coordinator for the Ecologist Party of Mexico (PVEM), left early from the meeting after expressing compliance with the proposed reforms. His party is expected to support the government, providing almost unanimous votes in favor.

In a related incident, tensions arose concerning the re-appointment of actor Sergio Mayer to his legislative seat; members of the Movimiento Ciudadano (MC) party criticized this decision. Juan Zavala, an MC deputy, voiced that legislative roles should not be treated lightly, indicating broader issues of membership legitimacy and the role of celebrity figures in politics. Mayer defended himself amidst the backlash, suggesting potential conflicts about the nature of political representation.