Tell him to have an eye to eye with an immigration attorney. it will be in his best interest.
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The divorce by itself is not a reason to revoke the legal resident status. That said, USCIS might want to make sure that yours was a good faith marriage and not a marriage entered into just so he could get a green card. He needs to be prepared to explain what happened to your marriage and to prove that it was a good faith marriage. I would advise talking to an immigration attorney to help him be prepared if the needs arises.
If his card its a two year conditional resident card, then he'll need to file to have those conditions removed prior the card's expiration. A divorce will factor into the USCIS decision whether or not they'll grant the petition to remove conditions.
Depends on the length of the marriage, whether he has the permanent card or the conditional card, and whether he can prove he entered into the marriage in good faith.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.