The US Supreme Court is the highest appellate court in the Judicial Branch of the federal government. It is the highest authority on cases, laws, and constitutional interpretations that fall under its jurisdiction.
The Court is the highest authority on federal law (except where Congress has specified otherwise), but not on state law unless the state law is relevant to a case under the Court's review, and is determined to be in conflict with the US Constitution.
The final authority in the federal system is the Supreme Court.
Supreme Court
The Supreme Court has the ultimate say on whether something is constitutional or not.
U.S Supreme Court
The Supreme Court of the United States, for matters that fall under its jurisdiction.
it acts as the final authority on the constitutionally of state and Federal Laws
The Judicial Branch has judicial authority which is the Supreme court.
The Supreme Court is the ultimate authority on the Constitution. The Supreme Court is responsible for upholding the Bill of Rights. It's part of the judicial branch, which serves as a system of checks and balances for the leglislative and executive offices.
The authority to overturn decisions made by the Supreme Court lies with the Supreme Court itself through the process of judicial review.
It established the authority of the Supreme Court to rule on the constitutionality of an act of Congress. That is, it resolved that the Supreme Court is the final authority when determining whether a law is Constitutional or not.
The Supreme Court itself has the authority to overturn its own decisions through a process called "overruling."
No one within the federal judiciary has authority to remove a Supreme Court justice from office. The Constitution vested Congress with the power of impeachment, which is the only way a Supreme Court justice may be forcibly removed. For more information, see Related Questions, below.