Immigration documents filed in 1961 cast doubt on whether Barack Hussein Obama Sr. was the president’s biological father and indicate federal officers were prepared to investigate whether the Kenyan was married to the president’s mother, Ann Dunham.

Aside from the image of a long-form birth certificate released by the White House April 27, 2011 – a document Sheriff Arpaio’s law enforcement investigation has found probable cause to believe is a forgery – what documentary evidence is there that Barack Obama was the biological father?

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