Institutional instability at Brazil’s Supreme Court, the **Supremo Tribunal Federal (STF)**, has reached new heights, centering on leaked information from a high-stakes plea deal in the financial "Dark Horse" case and triggering political maneuvering that threatens the top ranks of the **Brazilian judicial system**. The crisis, which pits two of the court’s most prominent justices against each other—Alexandre de Moraes and André Mendonça—has prompted the President of the Senate, Davi Alcolumbre, to signal that if he is forced to open an impeachment process against Justice de Moraes, he would also authorize a matching process against Justice Mendonça, a move described by local media as a high-risk "crossed impeachment."