I already have my I-20, and I have made an appointment at the U.S. consulate to get my visa.
However on the phone I was notified that the I-20 is not enough proof of me being able to support myself. My sponsor in the U.S. is providing complete financial support as stated on the I-20 as well. The amount on the I-20 is of course high enough.
What else can they want?