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Who has the power to declare a federal law unconstitutional in the United States?

  1. President.

  2. Supreme Court.

  3. Congress.

  4. State governors.

The correct answer is: Supreme Court.

The Supreme Court is the correct answer because they are responsible for interpreting the Constitution and determining if a federal law is in line with it. The President may veto a bill passed by Congress, but it can still become a law with a two-thirds majority vote from both houses. Congress is responsible for creating laws, but they are subject to review and potential invalidation by the Supreme Court. State governors do not have the authority to declare federal laws unconstitutional.