veto
legilslative branch
The President checks the power of the Supreme Court by appointing Supreme Court justices and the Chief Justice (subject to Senate confirmation).
The Supreme Court can check the power of Congress by ruling legislation passed by Congress is unconstitutional. The Supreme Court can do this when they a presented with an opportunity to hear a case which disputes a law. The supreme court's decision is final because it is the highest court in America.
The U.S. Supreme Court has the power to declare an act of Congress unconstitutional.
The supreme court can make sure the president doesn't abuse his power by deeming laws bills passed by the president unconstitutional.
Congress can check the power of the Supreme Court by introducing amendments to the Constitution.
veto
Courts can judge legislative acts to be unconstitutional. This means that the Supreme Court can say that a law that the Senate has passed is unconstitutional.
federal spending
veto
They help prevent presidents from becoming dictators.
The President can veto legislation. The Supreme Court can deem laws unconstitutional. The President nominates Supreme Court Justices.