Brazil's Supreme Court has recently become the center of a growing institutional conflict, as two of its most prominent justices, Alexandre de Moraes and Andre Mendonca, have demanded major sanctions against each other. The dispute stems from a federal investigation into financial fraud linked to the collapsed Banco Master and its owner, Daniel Vorcaro. De Moraes, known for leading a case against former President Jair Bolsonaro over an alleged coup attempt, is now under scrutiny after federal police discovered that his wife had provided legal services to Banco Master under a contract worth 130 million reais ($25 million). Intercepted messages between Vorcaro and de Moraes showed the banker had sought the justice’s advice, including requests to block legal actions against his bank. Mendonca, the first evangelical justice appointed to the court by Bolsonaro, has reportedly asked for de Moraes to be suspended while the court decides whether to investigate him for potential corruption. In response, de Moraes has called for Mendonca to be investigated by the court and possibly impeached by the Senate for conducting an unauthorized proceeding against him. The situation escalated when Mendonca released part of the federal police investigation, including messages between Vorcaro and de Moraes, increasing public and political pressure on de Moraes to resign. Flávio Bolsonaro, a presidential candidate linked to the Banco Master scandal for receiving around $21 million to fund a film about his father, also urged de Moraes to step down. The crisis deepened after Brazilian media reported that Mendonca had met with Vorcaro last year. Mendonca claimed the meeting was a routine discussion similar to those he had with other Supreme Court members about the same matter. He confirmed a more recent meeting with Vorcaro and said he questioned him without the full court’s authorization, as required to investigate a justice, and without the presence of federal police or prosecutors. Mendonca stated this was because Vorcaro claimed to have been mistreated by police, a claim the attorney general has dismissed as false. De Moraes has asked the court’s Chief Justice, Luiz Edson Fachin, to investigate Mendonca’s actions, calling them politically motivated. He accused Mendonca of committing an impeachable offense by interviewing Vorcaro under secretive conditions. Brazil's Senate has received numerous requests for impeachment proceedings against de Moraes, while only a few have been filed against Mendonca. Fachin has said he will seek clarifications from both Mendonca and de Moraes, as well as the attorney general and federal police director. During a recent ceremony with President Luiz Inácio Lula da Silva, Fachin emphasized his commitment to acting "what is right, in the time and in the shape that the legal order requires," without naming the ongoing tensions between the two justices. He stressed the importance of maintaining institutional stability during periods of political strain. De Moraes and Mendonca did not speak during recent court sessions and are scheduled to meet again next week.