In U.S.A., the Supreme Court has almost all legal powers, yet, the President and the Congress exercise a considerable influence over it. The Congress can remove the judges from their office through impeachment and can limit the functional area of the Supreme Court. The Congress can increase the number of the judges.
The Congress, by law, decides the terms and conditions of the judges’ term. It also decides their salaries and other facilities. The President appoints the judges and has a right to grant pardon to a criminal. Besides, whatever law is made by the legislature, its approval has to be taken from the President.