I'm on F3 visa via my US citizen father, I recently got divorced, my priority is now F1, what if I remarried my ex husband, can I file for him?

  The question is at what stage you are in your immigration. If you have not yet been approved for permanent residence under the F-1 category, you could remarry and both you and your husband would immigrate on the F-3 category. If you already have the green card through the F-1 category, your remarriage and petitioning for your husband could very conceivably have problems, and U.S.C.I.S. may begin revocation proceedings against your green card as having been received through a fraudulent divorce. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.