STF Rejects Extension of INSS CPMI with 8-2 Majority Vote

On March 26, 2026, Brazil's Supreme Federal Court (STF) decisively ruled against the extension of the Mixed Parliamentary Commission of Inquiry (CPMI) investigating the National Institute of Social Security (INSS). The court vote was 8 to 2, with ministers Flávio Dino, Alexandre de Moraes, Cristiano Zanin, Nunes Marques, Dias Toffoli, Cármen Lúcia, Gilmar Mendes, and Edson Fachin forming the majority. They held that the decision to extend the CPMI is an internal matter for the National Congress and not subject to judicial intervention.

This ruling overturned an earlier decision by Minister André Mendonça, who had authorized a 48-hour deadline for Senate President Davi Alcolumbre to read the request for extension, which was made by CPMI Chairman Senator Carlos Viana. Viana had argued the Senate leadership was slow to act on the matter, leading him to unilaterally postpone CPMI sessions and announce a 120-day extension pending the STF's final ruling.

The ruling underscores the autonomy of the legislative branch in managing its investigatory commissions and limits judicial interference in congressional procedures. Senator Viana had sought the extension to address perceived inaction by the Senate Board of Directors in progressing the inquiry.

With the STF's majority decision, the CPMI will not be extended beyond its current mandate, reinforcing the separation of powers amid ongoing investigations into the INSS.