Yes. Example? Senator Ted Cruz was born in Canada and was a dual citizen until his presidential run. He had to be an American citizen to be a Senator.

As an aside, its still puzzling that self described "principled Constitutionalists" never questioned his eligibility to be POTUS.

Finally, the majority of Americans with dual citizenship are NOT from the "saved for last" country.

Senator Ted Cruz was born in Canada and was a dual citizen until his presidential run. So puzzling that self described "principled Constitutionalists" never questioned his eligibility to be POTUS.

However, the answer to your question is, yes, Americans with dual citizenship are considered American citizens. Beyond that, the majority of Americans with dual citizenship are NOT from the "saved for last" country.