> You can't refuse to readmit a US citizen (as in a person that can prove that they're readily a US citizen) Note the: as in a person that can prove that they'

> You can't refuse to readmit a US citizen (as in a person that can prove that they're readily a US citizen) Note the: as in a person that can prove that they're readily a US citizen. If you don't have a passport, you probably can't readily prove you are a citizen.