Answer:
Judicial review is the power of the courts to review and potentially strike down actions taken by the legislative or executive branches of government that are deemed to be unconstitutional. This power is not explicitly mentioned in the U.S. Constitution, but it has been recognized and utilized by the Supreme Court in a number of landmark cases.
The legal case that established the use of judicial review was Marbury v. Madison, which was decided by the U.S. Supreme Court in 1803. In that case, the Court ruled that the Judiciary Act of 1789, which had been passed by Congress, was unconstitutional. This decision established the principle that the Supreme Court has the authority to declare a law unconstitutional and therefore null and void.
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