I came to the United States for political asylum. My asylum was granted by immigration judge in New York and later moved Chicago. I applied my green card there and received three years after. I got married culturally, but never obtained legal document of marriage. 7 years later I divorced culturally, and again no legal process involved. I have never claimed as a married man, because my marriage never met the definition of marriage. When I applied US citizenship, I stated "never married", but listed children we had together with my ex. My ex and I had argument where she wanted the relationship back, but I never wanted. I married with my current wife culturally again and we have three children and living with very happy life. However, my ex told me that she called immigration and told them that I have two wives, her and my current wife which is entirely lie. She wants to ruin my life, but I would never let her do that. I submitted my N-400 back in 2009, had my interview in early 2010, passed the exam, fingerprints returned clear. I had no trouble with the law, paid my taxes on time, served the country through AmeriCorps, currently graduate student who would like to contribute to this country in so many different ways. Few months ago, I moved to twincities for work, notified USCIS for changing address, and yesterday I received letter from immigration for another interview, so I was wondering whether they asking me additional questions based on what my ex told them or starting over the whole process? I always appreciate your advice and support.