A Supreme Court decision can be overturned by a constitutional amendment or a new ruling from the Supreme Court.
Congress may also pass new legislation or even amend existing laws to address any issues that are raised by the court's decision.
However the Supreme Court's decisions are nearly always final but can sometimes be overturned.
Two thirds of both houses of Congress must propose an amendment to the Constitution and three quarters of the states must ratify the amendment.
The Supreme Court of the United States is who declares the laws unconstitutional.
The Supreme Court has the power to declare the laws unconstitutional and this power is called judicial review.
The Supreme Court's power of judicial review allows it to declare laws and executive actions unconstitutional if they violate the Constitution.
This power was established by the Supreme Court in the 1803 case Marbury v Madison.
The Supreme Court can also strike down state laws which also violate the Constitution.
Also the Supreme Court's justices are nominated by the president and confirmed by the Senate.
The legislative branch makes laws, but the judicial branch can declare those laws unconstitutional.
A law is considered unconstitutional if the law violates the United States Constitution.
The Supreme Court has the power to determine if a law is unconstitutional through judicial review.
A law is also constitutional if a body of government passes a law which doesn't have the authority to pass it.
If a law limits a humans rights like freedom of expression or the right to a fair trial, if the law contradicts other parts of the constitution, if a law distinguishes people based on race, religion or natural original or if a law requires that someone give up a constitutional right in order to receive a public benefit the law would be unconstitutional.