no
Congress cannot declare laws unconstitutional. The Judiciary Branch may declare a law unconstitutional only if it conflicts with some provision of the State or Federal Constitution. The Supreme Court can rule a law to be unconstitutional, but Congress, along with the States, can only amend the Constitution.
declare a law unconstitutional
yo ma
They would declare it to be unconstitutional. When that happens, the law is rendered null and void.
the supreme court can declare laws unconstitutional
The Supreme Court has the authority to interpret the Constitution.
You can file in federal court to protect yourself from enforcement of a unconstitutional law. If you lose, you can appeal and if you win enough appeals, the case may get to the Supreme Court which can declare that the law is unconstitutional.
Congress cannot veto a law. Any law must be written and passed by Congress in the first place. The president can then veto it. Congress can override the veto with a 2/3 majority. After a law is passed, the Supreme Court can strike it down if they declare the law unconstitutional.
The name given to the Supreme Court's power to declare a law unconstitutional is judicial review.
The Supreme Court holds the power of judicial review, meaning it can declare a law unconstitutional. The law would then be repealed, checking the power of congress. (see Marbury V. Madison)
The SC can declare a law constitutional or unconstitutional.
In the United States, the power to declare a law unconstitutional lies with the judicial branch of government, specifically the federal courts, including the Supreme Court.