Barack Obama citizenship conspiracy theories
During Barack Obama's campaign for president in 2008, throughout his presidency and afterwards, there was extensive news coverage of Obama's religious preference, birthplace, and of the individuals questioning his religious belief and citizenship – efforts eventually known as the "birther movement", or birtherism, names by which it is widely referred to across media. The movement falsely asserted Obama was ineligible to be President of the United States because he was not a natural-born citizen of the United States as required by Article Two of the Constitution.
Source: Wikipedia — Barack Obama citizenship conspiracy theories (CC BY-SA 4.0)