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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 has the power to declare a federal law unconstitutional in the United States. This power is known as judicial review and is one of the checks and balances in the US government. The President (option A) does not have the authority to declare a law unconstitutional, although they can veto a law passed by Congress. Congress (option C) also does not have the power to declare a law unconstitutional, although they can pass amendments to the Constitution or propose a new law to override a previous one. State governors (option D) also do not have the power to declare a federal law unconstitutional, as the Supreme Court holds the final authority on interpreting the Constitution and federal laws.