Birther (noun)

A person who promotes the theory that a certain individual, typically a political leader, is not a natural-born citizen of the country in which they hold citizenship and thus is not eligible to hold certain offices.

Origin:

Early 21st century, from birth + -er.

Examples:

1. He was a vocal birther who claimed that the president was not born in the United States.
2. Birthers often question the legitimacy of the president's birth certificate.
3. The birther movement was largely discredited by the release of the president's long-form birth certificate.
4. Some birthers believe that the president was actually born in Kenya, not Hawaii.
5. The birther conspiracy theory was widely considered to be a racist and xenophobic attack on the president.