The judicial branch of government is established in Article III of the Constitution with the creation of the Supreme Court. This court is the highest court in the country and is empowered with the judicial powers of the government. There are lower Federal courts but they were not created by the Constitution. Rather, Congress deemed them necessary and established them using power granted from the Constitution. Courts decide arguments about the meaning of laws, how they are applied, and whether they break the rules of the Constitution. A court's authority to decide constitutionality is called judicial review.