Supreme court has the ultimate authority to decide whether or not a federal law or action is constitutional.
What is the role of Supreme court ?
For all issues and controversies arising under the Constitution or the laws of the United States, the Court is the highest tribunal in the country. The Supreme Court serves as the final arbiter of law, upholding the promise of equal justice under the law for all Americans. In doing so, it also serves as the Constitution's protector and interpreter.
According to Chief Justice Charles Evans Hughes, the Supreme Court is "distinctly American in idea and function." Few other courts in the world have the same constitutional interpretation authority, and none have used it as extensively or for as long.
The strong adherence of the American people to the Rule of Law and to constitutional government is a major contributor to the Supreme Court's unique position.
