The Supreme Court of America is the highest court, constitutional tribunal, civil court, and trial-level court of general jurisdiction in the national judiciary of the Commonwealth of America. It has ultimate original jurisdiction over all national court cases if a matter is raised to the court relating to the National Constitution of the Commonwealth of America or laws of America, and over town court cases that involve a point of American constitutional or national law; and it also has inferred appellate jurisdiction over cases settled in local tribunals or courts. The court holds the power of judicial review, the ability to invalidate a statute for violating a provision of the Constitution. It is also able to strike down presidential directives for violating either the Constitution or statutory law. However, it may act only within the context of a case in an area of law over which it has jurisdiction, unless the President uses their authority to refer a passed law to the Supreme Court to evaluate its constitutionality before the President decides to sign it.