well actually you needd to go to the mexican consulate in youre town and get a mexican passport its about 35 dollars for one year, but if its too late i belive you can still travel with youre green card but they will investigate you more.
He can leave and re-enter the US with a valid passport and his green card; whether he will need a visa to enter Mexico will depend on their reciprocity with his country of citizenship.
What documents need a permanent resident of the USA to travel as a tourist to Mexico by air for a week?
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