A US citizen cannot be barred from entering the US. That is one of the key rights of citizenship. A US citizen is also required to present their US passport wh

A US citizen cannot be barred from entering the US. That is one of the key rights of citizenship. A US citizen is also required to present their US passport when entering the US - even if they are a dual citizen and hold another passport. The whole thing about dual citizens refers to citizens of the banned countries who also hold citizenship of a third country - i.e. one that is not the US and one that is not banned. e.g. an Iraqi-Canadian who presents a Canadian passport is still barred from the US by Trump's order.