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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 only branch of the federal government with the power to declare a federal law unconstitutional. This is established in the principle of checks and balances, where each branch of government has some power over the other branches to prevent any one branch from becoming too powerful. The President (A), Congress (C), and state governors (D) do not have this specific power and their roles are not related to the interpretation of laws. The President can veto laws passed by Congress and nominate Supreme Court justices, but cannot declare laws unconstitutional. Congress can create and pass laws, but the Supreme Court can declare them unconstitutional. State governors have limited influence on federal laws since they are responsible for their respective state's laws and policies.