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circa 1925: Studio headshot portrait of 29th United States president Warren Gamaliel Harding (1865 - 1923). (Photo by Hulton Archive/Getty Images)

circa 1925:  Studio headshot portrait of 29th United States president Warren Gamaliel Harding (1865 - 1923).  (Photo by Hulton Archive/Getty Images)

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President Warren Gamaliel Harding (1865 - 1923) (R) the 29th President of the United States seen here with Calvin Coolidge (1872 - 1933), his Vice-President and successor. (Photo by Topical Press Agency/Getty Images)

President Warren Gamaliel Harding (1865 - 1923) (R) the 29th President of the United States seen here with Calvin Coolidge (1872 - 1933), his Vice-President and successor.    (Photo by Topical Press Agency/Getty Images)

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Tinted portrait of American President Warren G. Harding (1865 - 1923) surrounded by his wife Florence Harding and father Dr. Gerorge T. Harding, 1920s. (Photo by Hulton Archive/Getty Images)

Tinted portrait of American President Warren G. Harding (1865 - 1923) surrounded by his wife Florence Harding and father Dr. Gerorge T. Harding, 1920s. (Photo by Hulton Archive/Getty Images)

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US President Warren G Harding (1865 - 1923) and First Lady, Florence Harding, watch from a balcony as an annual Easter Monday children's egg-rolling event takes place on the White House lawn, Washington DC, circa 1922. With them is their pet dog, Laddie Boy. (Photo by FPG/Keystone View Company/Archive Photos/Getty Images)

US President Warren G Harding (1865 - 1923) and First Lady, Florence Harding, watch from a balcony as an annual Easter Monday children's egg-rolling event takes place on the White House lawn, Washington DC, circa 1922. With them is their pet dog, Laddie Boy. (Photo by FPG/Keystone View Company/Archive Photos/Getty Images)

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circa 1923: Warren Gamaliel Harding, 29th President of the United States, outside the White House with his dog Laddie Boy. (Photo by Library Of Congress/Getty Images)

circa 1923:  Warren Gamaliel Harding, 29th President of the United States, outside the White House with his dog Laddie Boy.  (Photo by Library Of Congress/Getty Images)