The quo warranto petition against Maria Lourdes Sereno, filed before the Supreme Court of the Philippines, led to the landmark case Republic v. Sereno (G. R. No. 237428), which nullified Maria Lourdes Sereno's appointment as Chief Justice of the Supreme Court of the Philippines, finding that she never lawfully held the office due to a lack of integrity for failing to file certain required financial documents. As a result, she was ousted from the Supreme Court as Chief Justice. The Court handed down its ruling on May 11, 2018. The case began with a filing before the House of Representatives of an impeachment demand, the accusations in which Solicitor General Jose Calida used as the factual basis for his quo warranto petition.