On August 15, 1973, in his second address to the nation concerning the Watergate trial, President Richard Nixon denies any role in a cover-up.

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On March 21, 1973, in a secretly recorded conversation, President Richard Nixon and his aide John Dean discuss the unfolding Watergate scandal. Dean tells Nixon that the cover-up is "a cancer on the presidency."

In an address to the nation on April 29, 1974, President Richard Nixon explains why he will not be turning over additional subpoenaed tapes in the Watergate trial but will instead provide transcripts of the recordings.

On August 15, 1973, President Richard Nixon addresses the nation concerning Watergate, explaining his refusal to turn over subpoenaed presidential tape recordings.

On October 20, 1973, President Richard Nixon dismissed Special Prosecutor Archibald Cox and accepted the resignations of Attorney Gen. Elliot L. Richardson and Deputy Attorney Gen. William D. Ruckelshaus. Later that night, Sen. Alan Cranston reacts to what became known as the "Saturday Night Massacre."

In a secretly recorded conversation on April 16, 1973, President Richard Nixon discusses with his aide John Dean the need to have the resignations of Dean, H.R. Haldeman and John Ehrlichman "at the ready" in the wake of the Watergate scandal.

In this History Rocks the 70's video, brought to you by the History Channel, learn about special investigator Archibald Cox's quest to investigate the Watergate cover-up. Nixon tries to get Cox fired several times. He asks Attorney General Elliot Richardson and Deputy Attorney General Ruckelshaus; both refuse and resign.