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A demonstration outside the Whitehouse in support of the impeachment of President Nixon (1913 - 1994) following the watergate revelations. (Photo by MPI/Getty Images)

A demonstration outside the Whitehouse in support of the impeachment of President Nixon (1913 - 1994) following the watergate revelations.   (Photo by MPI/Getty Images)

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Richard Nixon (1913 - 1994) gives the thumbs up after his resignation as 37th President of the United States. His son-in-law David Eisenhower is with him as he says goodbye to his staff at the White House, Washington DC. (Photo by Gene Forte/Consolidated News Pictures/Getty Images)

Richard Nixon (1913 - 1994) gives the thumbs up after his resignation as 37th President of the United States. His son-in-law David Eisenhower is with him as he says goodbye to his staff at the White House, Washington DC.   (Photo by Gene Forte/Consolidated News Pictures/Getty Images)

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9th August 1974, American President Richard Nixon is pictured making his emotional resignation speech following the Watergate scandal (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

9th August 1974, American President Richard Nixon is pictured making his emotional resignation speech following the Watergate scandal  (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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Political Personalities, pic: 30th November 1978, Former U,S, President Richard Nixon, (1913-1994) adresses the Oxford Union (Photo by Popperfoto via Getty Images/Getty Images)

Political Personalities, pic: 30th November 1978, Former U,S, President Richard Nixon, (1913-1994) adresses the Oxford Union  (Photo by Popperfoto via Getty Images/Getty Images)

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11th May 1973: American politician and former attorney-general John Mitchell, one of Richard Nixon's top aides, is sworn in at the Senate. He is facing charges in connection with the Watergate scandal. His wife Martha Mitchell is second from right. American President Richard Nixon is on the left. (Photo by Keystone/Getty Images)

11th May 1973:  American politician and former attorney-general John Mitchell, one of Richard Nixon's top aides, is sworn in at the Senate. He is facing charges in connection with the Watergate scandal.  His wife Martha Mitchell is second from right. American President Richard Nixon is on the left.  (Photo by Keystone/Getty Images)