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377869 31: Portrait of 31st United States President Herbert Hoover. (1929-1933) (Courtesy of the National Archives/Newsmakers)

377869 31: Portrait of 31st United States President Herbert Hoover. (1929-1933) (Courtesy of the National Archives/Newsmakers)

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circa 1928: Herbert Hoover (1874 - 1964), Republican Party candidate for the Presidency of the United States of America, listening to a one valve radio set. (Photo by Topical Press Agency/Getty Images)

circa 1928:  Herbert Hoover (1874 - 1964), Republican Party candidate for the Presidency of the United States of America, listening to a one valve radio set.  (Photo by Topical Press Agency/Getty Images)

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With unidentified others, American politician US President Herbert Hoover (1874 - 1964) and his wife, First Lady Lou Henry Hoover (1874 - 1944), stand at attention on a reviewing stand, 1928. (Photo by PhotoQuest/Getty Images)

With unidentified others, American politician US President Herbert Hoover (1874 - 1964) and his wife, First Lady Lou Henry Hoover (1874 - 1944), stand at attention on a reviewing stand, 1928. (Photo by PhotoQuest/Getty Images)

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circa 1935: Herbert Hoover (1874 - 1964), the 31st President of the United States, with his dog. (Photo by Library Of Congress/Getty Images)

circa 1935:  Herbert Hoover (1874 - 1964), the 31st President of the United States, with his dog.  (Photo by Library Of Congress/Getty Images)

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circa 1962: Portrait of former American president Herbert Hoover (1874 - 1964) seated in an armchair with a pipe in his suite at the Waldorf Towers, New York City. (Photo by Hulton Archive/Getty Images)

circa 1962:  Portrait of former American president Herbert Hoover (1874 - 1964) seated in an armchair with a pipe in his suite at the Waldorf Towers, New York City.  (Photo by Hulton Archive/Getty Images)