The judicial branch is established by Article III of the Constitution. It is responsible for deciding the constitutionality of federal laws and resolving disputes about federal laws. The judicial power of the United States is vested in one Supreme Court and in such inferior courts as Congress may from time to time ordain and establish. The Supreme Court is the highest court in the United States and is vested with the judicial powers of the government. The Constitution grants Congress the power to establish courts inferior to the Supreme Court, and to that end, Congress has established the United States district courts, which try most federal cases, and 13 United States courts of appeals, which review appealed district court cases. The judges of the Supreme Court and inferior courts hold their offices during good behavior and receive compensation that cannot be diminished during their continuance in office.