Most likely, your alien fiance does not have a Social Security number (unless he had been working in the U.S., with USCIS authorization, before). If so, write "none" in the appropriate section of the form. G-28 is the form that your attorney would submit. Since you don't have anyone representing you, leave that section blank or write "n/a" in it.
Answered on Jan 30th, 2013 at 9:51 PM