The US Supreme Court has rejected a claim that President-elect Barack Obama is ineligible to serve as President because he had dual nationality at birth. The US Constitution requires presidents to be "natural-born citizens", i.e. born on US territory, not naturalized later. President-elect Obama was born in Hawaii, thereby qualifying him as a "natural-born citizen." Other lawsuits allege that his Hawaii birth certificate is fake. However independent bodies, including the nonpartisan Factcheck.org, believe it is genuine.