Final answer:
The Watergate scandal involved President Nixon and the wiretapping of the DNC. Nixon resigned in 1974 due to his role in covering up the crime. The event is a defining moment in U.S. political history.
Step-by-step explanation:
The scandal that involved President Nixon and the wiretapping of the Democratic National Committee is known as the Watergate scandal. In the summer of 1973, televised Senate hearings captured the attention of the American public as former administration members testified about their involvement. Notably, the break-in at the DNC's headquarters during the 1972 presidential campaign was orchestrated by the Committee to Re-Elect the President (CREEP), with the support of Nixon's top advisors and Nixon himself. This operation, among others, was part of a broader strategy to sabotage Nixon's political opponents. Nixon's involvement in the cover-up of these activities led to his resignation in 1974, making him the first U.S. president to do so.