Brazil’s Supreme Court has cancelled plenary sessions following a widening rift between justices Alexandre de Moraes and André Mendonça. The dispute, which involves allegations of improper conduct related to the collapsed Banco Master, has intensified political uncertainty just weeks ahead of the October 4, 2026, presidential elections.
The Brazilian Supreme Court is facing a severe institutional deadlock, with Chief Justice Luiz Edson Fachin cancelling back-to-back plenary sessions on September 9 and 10, 2026. This administrative pause is an attempt to contain a deepening internal conflict within the high court, as tensions between justices Alexandre de Moraes and André Mendonça have brought judicial proceedings to a standstill.
The crisis originated on September 1, 2026, when Justice Mendonça released federal police documents related to an investigation into the collapsed financial entity, Banco Master. The records suggest that the bank's former owner, Daniel Vorcaro, frequently sought legal guidance from Justice de Moraes. Furthermore, the documents have sparked allegations regarding a potential contract worth up to R$131 million involving a law firm linked to the spouse of Justice de Moraes. These claims have triggered calls for formal investigations and have fueled a direct confrontation between the two justices.
For investors and global market observers, this situation is significant due to its impact on Brazil’s institutional stability. A judiciary seen as polarized or embroiled in internal corruption allegations can introduce volatility into the broader political environment. When the highest court in the country is perceived to be failing in its function, it can create concerns about the long-term predictability of legal and regulatory frameworks, which are essential for foreign direct investment and business operations.
This judicial turmoil is coinciding with a critical period for Brazil, with presidential elections scheduled for October 4, 2026. Political factions from across the spectrum are actively using the scandal as a campaign tool, further deepening societal and political polarization. The involvement of top judicial figures in controversies that are now being weaponized in the electoral race adds a layer of uncertainty that the markets are monitoring closely.
The next major update for stakeholders will be the full plenary session scheduled for September 15, 2026. During this meeting, the court is expected to deliberate on whether to initiate a formal investigation into Justice de Moraes. The outcome of this session will be a critical monitorable, as it will likely determine whether the judiciary can restore its internal functionality or if the standoff will continue to overshadow the lead-up to the national elections.