At this point, divorcing your husband will not affect your permanent green card or precipitate another interview with the USCIS. Your marriage was recognized as valid; case closed. Nevertheless, I suggest that you should ask an attorney well-versed in immigration law to represent you in the divorce: when you will file for naturalization, the USCIS will review the divorce decree and the document called "Findings of fact and conclusions of law" which the judge signs at the end of a divorce proceeding. Technically, your eligibility for citizenship does not depend on preservation of the marriage through which you got your green card; but, as a practical matter, getting divorced right after receiving a green card is likely to ruffle Immigration's feathers; and careful wording of the divorce documents can save you from considerable complications.
Answered on Aug 27th, 2012 at 1:19 PM