Then the USA should pull his citizenship. That's possible, but only because Thiel was born out of the USA. Natural born citizens must voluntarily renounce thei

Then the USA should pull his citizenship. That's possible, but only because Thiel was born out of the USA. Natural born citizens must voluntarily renounce their citizenship, it can't be "pulled" from them: https://en.wikipedia.org/wiki/Fourteenth_Amendment_to_the_United_States_Constitution#Loss_of_citizenship https://en.wikipedia.org/wiki/Fourteenth_Amendment_to_the_Un... For much of the country's history, voluntary acquisition or exercise of a foreign citizenship was considered sufficient cause for revocation of national citizenship. This concept was enshrined in a series of treaties between the United States and other countries (the Bancroft Treaties). However, the Supreme Court repudiated this concept in Afroyim v. Rusk (1967), as well as Vance v. Terrazas (1980), holding that the Citizenship Clause of the Fourteenth Amendment barred the Congress from revoking citizenship. However, Congress can revoke citizenship that it had previously granted to a person not born in the United States.