But per Marshall's earlier interpretation, Section 13 of the Judiciary Act said that the Supreme Court "did" have original jurisdiction over mandamus cases like Marbury's. This meant that the Judiciary Act apparently took the Constitution's initial scope of the Supreme Court's original jurisdiction and expanded it to include cases involving writs of mandamus. Marshall ruled that Congress cannot increase the Supreme Court's original jurisdiction as it was set down in the Constitution, and therefore held that the relevant portion of Section 13 of the Judiciary Act violated Article III of the Constitution.