Geraghty defined the concerns most clearly, stating: "If Obama were born outside the United States, one could argue that he would not meet the legal definition of natural-born citizen … because U.S. law at the time of his birth required his natural-born parent (his mother) to have resided in the United States for '10 years, at least [f]ive of which had to be after the age of 16.'"
He then points out Ann Dunham, Obama's mother, was 18 when Obama was born "so she wouldn't have met the requirement of five years after the age of 16."
Geraghty continues: " (Interestingly, apparently there isn't much paperwork on Obama's parents' marriage. 'Obama: From Promise to Power,' page. 27: 'Obama later confessed that he never searched for the government documents on the marriage, although Madelyn (Obama's maternal grandmother) insisted they were legally married.' Also note that Obama's father apparently was not legally divorced from his first wife back in Kenya at the time, a point of contention that ultimately led to their separation.)"
