I am kind of confused. My I-130 petition for my wife has been approved and our I-485 interview date will be in April. But I got a letter from National Visa Center yesterday asking me to submit (1) a Choice of Agent and Adress from and (2) $70 of Affidavit of Support Fee (they will then send me the affidavit of support I-864 form once the payment is cleared.) My wife is in the U.S. and we are applying for adjustment of status in Oregon. I thought we just need to pass the interview and get her passport stamped and that will be all. Does anyone know what this $70 affidavit of support fee is about? Is it because that they think we are doing CP rather than AOS? We did submit a I-864 affidavit of support with our I-485 application. Thanks.