Brazilian Supreme Court confrontation erupts weeks before presidential vote

Courtroom dispute becomes a national spectacle

A bitter conflict inside Brazil’s Supreme Court broke into public view on September 15 when justices exchanged accusations during a nationally livestreamed hearing. Alexandre de Moraes accused André Mendonça of serving a political faction connected to an attempted coup, which Mendonça denied. Justice Gilmar Mendes then accused Mendonça of using the court’s work to produce political disorder before the presidential election.

The immediate issue was whether the court should open an investigation into Moraes’s conduct. Moraes has separately sought an investigation of Mendonça. No finding of wrongdoing against either justice had been reached during the reported hearing, and allegations contained in police material remain contested. The significant new development is the open institutional confrontation, not a judicial determination that either judge committed a crime.

Banco Master case drives the rupture

The dispute grew from the investigation into collapsed Banco Master and its owner, Daniel Vorcaro, who was arrested last November while preparing to leave Brazil. Investigators have examined alleged relationships between the banker and members of Brazil’s political and judicial elite. Mendonça recently unsealed a police dossier containing communications attributed to Vorcaro and Moraes and a reported contract involving the law firm of Moraes’s wife.

Mendonça’s critics accuse him of accelerating scrutiny of Moraes while slowing examination of links between Vorcaro and the Bolsonaro family. Moraes says he is the target of politically motivated falsehoods and has raised the possibility of foreign election interference. Those competing assertions have not been adjudicated, so they are important to the political stakes but cannot be presented as established conclusions.

An election fought through the courts

The crisis comes less than three weeks before the first round of Brazil’s presidential election, with President Luiz Inácio Lula da Silva and far-right challenger Flávio Bolsonaro in a close contest. Moraes is associated in the public mind with Lula because he prosecuted Jair Bolsonaro over the former president’s attempted power grab, although Moraes was appointed by former president Michel Temer and Lula is not implicated in the banking allegations.

The central risk is damage to confidence in the judiciary during an already polarised campaign. An official European Council analysis published earlier in 2026 identified Brazil’s election as highly competitive and politically consequential, while the EU has separately emphasized the importance of protecting independent courts from pressure and interference. What follows—formal inquiries, recusals or procedural compromise—could shape both the court’s authority and the election’s final weeks.