Which historic event established that no member of government, including the president, is considered above the law?

Question

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The Nixon Administration's attempt to cover-up the actions of the president's re-election committee, which was responsible for breaking into Democratic Party Headquarters in the Watergate Hotel, ultimately involved illegalities perpetrated by the most senior members of the White House staff, including Nixon himself. Facing almost certain impeachment, Nixon resigned in disgrace two years later after testimony incriminated him and sent many of his staff members to prison.

Which Historic Event Established That No Member of Government, Including