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Hello, I am currently a U.S. citizen and thinking about applying for /renewing B1/B2 tourist visa for my dad. My parent once came to the U.S. on tourist B1/B2 visa around 11 years ago, and at that time, I was a student on F1 visa applying for the tourist visa for my dad. Now, the B1/B2 visa that my dad held was expired, and my immigration status also shifted from an international student to a U.S. citizen. I want to know, in this situation, if I want to get a new tourist visa for my dad to come to the U.S. to visit me now, do i need to completely apply for a new tourist visa for him? Or, is there a possibility to renew the previous expired visa and possibly skip the interview at consular office? Thank you very much for all your help!