1. Called witnesses to testify in the investigation of the Watergate break-in and cover-up.
2. Was the first to publish information about the break-in, helping bring the scandal to light.
3. Refused to cooperate with the Watergate investigation.
4. Ruled that Nixon's claim of executive privilege did not extend to his secret tape recordings.
5. Approved articles of impeachment against Nixon.

The Watergate scandal involved the break-in at the Democratic National Committee headquarters, Nixon's claim of executive privilege, and his resignation following the approval of articles of impeachment.

Explanation:

Watergate Scandal: The Watergate scandal refers to the political scandal in the United States during the early 1970s, involving the break-in at the Democratic National Committee headquarters and subsequent cover-up efforts by the Nixon administration.

Executive Privilege: Nixon claimed executive privilege to withhold White House tape recordings from the investigation, but the Supreme Court ruled against him in United States v. Nixon (1974), stating that executive privilege does not extend to refusing to turn over records related to criminal proceedings.

Impeachment: The House Judiciary Committee approved articles of impeachment against Nixon for obstruction of justice, abuse of power, and contempt of Congress. Facing almost certain impeachment, Nixon resigned from the presidency on August 9, 1974.

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