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Official White House portrait of President John F. Kennedy (1917 - 1963). This iconic image was made at the Senate Office Building in Washington, D.C. in January 1960. (Photo by Bachrach/Getty Images)

Official White House portrait of President John F. Kennedy (1917 - 1963). This iconic image was made at the Senate Office Building in Washington, D.C. in January 1960. (Photo by Bachrach/Getty Images)

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WASHIGTON DC, UNITED STATES - MARCH 14: John Fitzgerald Kennedy during a press conference on March 14, 1962 in Washington DC, United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

WASHIGTON DC, UNITED STATES - MARCH 14: John Fitzgerald Kennedy during a press conference on March 14, 1962 in Washington DC, United States. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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circa 1958: Portrait of US senator John F Kennedy (1917 - 1963) of Massachusetts sitting at his desk with a pen and paperwork. (Photo by Hulton Archive/Getty Images)

circa 1958:  Portrait of US senator John F Kennedy (1917 - 1963) of Massachusetts sitting at his desk with a pen and paperwork.  (Photo by Hulton Archive/Getty Images)

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WASHINGTON, : John Fitzgerald Kennedy (1917-63), pictured in the 1960s in Washington, D.C. 09 November 1960, he was the first Catholic, and the youngest person, to be elected for Democratic party the president of the USA. 22 November 1963, Kennedy was assassinated while being driven in an open car through Dallas. (Photo credit should read AFP/AFP via Getty Images)

WASHINGTON, :  John Fitzgerald Kennedy (1917-63), pictured in the 1960s in Washington, D.C. 09 November 1960, he was the first Catholic, and the youngest person, to be elected for Democratic party the president of the USA. 22 November 1963, Kennedy was assassinated while being driven in an open car through Dallas. (Photo credit should read AFP/AFP via Getty Images)

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John F Kennedy (1917 - 1963), American president-elect, with his wife Jacqueline (1929 - 1994) at the christening of their son John F Jr. (1960 - 1999) in Washington. (Photo by Keystone/Getty Images)

John F Kennedy (1917 - 1963), American president-elect, with his wife Jacqueline (1929 - 1994) at the christening of their son John F Jr. (1960 - 1999) in Washington.    (Photo by Keystone/Getty Images)