UNITED STATES V. NIXON (1974)
In this case, the Supreme Court found that even the president has to follow the law; he can't hide behind executive privilege. During the Watergate scandal, the special prosecutor subpoenaed President Nixon to hand over audio tapes and documents related to his possible participation in the cover up. Nixon, supported by a few of his Republican allies, had tried to argue that he didn't have to turn over evidence of his own wrongdoing to Congress because as president he had special rights. The Supreme Court held that the president is not above the law. Shortly after this ruling, Nixon resigned to avoid impeachment.