A law is '''unconstitutional''' when it conflicts with the Constitution of that country. In the [[United States]], generally federal courts are responsible for determining whether a law conflicts with the [[United States Constitution]] with the [[Supreme Court of the United States]] being the final arbiter. Courts have had this power since [[Marbury v. Madison]] although there is little explicit basis for the power in the Constitution itself. | A law is '''unconstitutional''' when it conflicts with the Constitution of that country. In the [[United States]], generally federal courts are responsible for determining whether a law conflicts with the [[United States Constitution]] with the [[Supreme Court of the United States]] being the final arbiter. Courts have had this power since [[Marbury v. Madison]] although there is little explicit basis for the power in the Constitution itself. |