If he entered the US unlawfully, he will be barred from reentry for a period of 10 years. If he remains in the US, he will still not be able to legalize his status even if he is married to you, because of the unlawful entry. If he entered the US lawfully and has just overstayed, then do not let him leave the US because he will be barred from reentry. Instead, you can get married and petition for him here as your spouse and he will be eligible for a green card. Once he gets that, then you can leave to go to Mexico. Please let me know if you have any additional questions or how I can be of further assistance to you in this matter.
Answered on Jan 11th, 2013 at 12:10 AM