My mom was born in Mexico and now she is a legal US permanent resident. I heard that everyone traveling to Mexico needs a passport to come back to the US. She is spending Christmas in Mexico, does she need a passport to come back in January? If she does, from what country? I tried to apply to get a passport for her in US, but they didn't accept the "green card." So what does she need to re-enter the US? The Mexican passport, just the "green card, or something else?" Thank you!
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