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circa 1968: Portrait of Pat Nixon (1912 - 1993), wife of American President Richard Nixon, seated in a wooden chair in a red dress. (Photo by Hulton Archive/Getty Images)

circa 1968:  Portrait of  Pat Nixon (1912 - 1993), wife of American President Richard Nixon, seated in a wooden chair in a red dress.  (Photo by Hulton Archive/Getty Images)

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Wife of President Richard Nixon and First Lady of the United States, Pat Nixon (1912-1993) posed wearing her inauguartion ball gown in yellow in Washington DC, January 1969. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

Wife of President Richard Nixon and First Lady of the United States, Pat Nixon (1912-1993) posed wearing her inauguartion ball gown in yellow in Washington DC, January 1969. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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Portrait of American First Lady Pat Nixon (1912 - 1993) and US President Richard M Nixon (1913 - 1994) as they pose together at the White House, Washington DC, circa 1969. (Photo by PhotoQuest/Getty Images)

Portrait of American First Lady Pat Nixon (1912 - 1993) and US President Richard M Nixon (1913 - 1994) as they pose together at the White House, Washington DC, circa 1969. (Photo by PhotoQuest/Getty Images)

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380450 28: President and Mrs. Nixon look at the ocean January 13, 1971 at a beach in San Clemente, CA. (Photo by National Archive/Newsmakers)

380450 28: President and Mrs. Nixon look at the ocean January 13, 1971 at a beach in San Clemente, CA. (Photo by National Archive/Newsmakers)

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Portrait of former Vice-President Richard Nixon with his wife Pat and their daughters, Julie and Tricia, United States, 1965. (Photo by Underwood Archives/Getty Images)

Portrait of former Vice-President Richard Nixon with his wife Pat and their daughters,  Julie and Tricia, United States, 1965. (Photo by Underwood Archives/Getty Images)