The legal concept or theory whereby a court declares a law unconstitutional is commonly called "judicial review." This was not so much established as confirmed by the US Supreme Court case Marbury v. Madison.
The Supreme Court would make that determination.
Judicial Review
judial review
judicial review
judicial review
judicial reveiw go apex kids :)
The Supreme Court declares a federal law unconstitutional.
That the law doesn't follow the constitution.
That the law doesn't follow the constitution.
judial review
If the US Supreme Court declares an Executive Order (Presidential action) unconstitutional, it is checking the Executive Branch.
If a state court declares a state law unconstitutional, the state will probably appeal the case to the state supreme court. If a state court declares a federal law unconstitutional, the losing party in the case will appeal the decision in the federal courts. The case could ultimately be heard by the US Supreme Court; however, if a lower court reverses the state court's decision and either the appropriate US Court of Appeals Circuit Court or US Supreme Court decline to consider the case, the decision of the lower federal court would be final. The US Supreme Court is the ultimate arbiter of constitutionality.