[Cheburashka]

Indonesia prohibits dual-citizenship.
After he was adopted, he became an Indonesian citizen.

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Indonesia may not recognize dual citizenship, but the U.S. does. Indonesian law is applied in Indonesia, American law is applied in America. And there is no provision in American law that allows a parent or stepparent to renounce a minor child's citizenship.

The provisions of the 1930 Hague Convention do not apply, since they are conditional on the state (in this case the U.S.A.) recognizing that a parent or stepparent can renounce a minor’s citizenship. As I said, there is no provision in American law that allows that.

[Extremely Extreme Extremist]

Indonesia may not recognize dual citizenship, but the U.S. does.

Not when it pertains to meeting the eligibility requirements for President it doesn't.