After the form is completed, upload, and submit the signed form to NVC via CEAC along with the sponsor's supporting financial evidence. Providing proof of domicile in the United States is critical for most people when submitting Form I864, Affidavit of Support.Use this form to show they have adequate means of financial support and are not likely to rely on the US government for financial support. This guide will clarify what domicile is, how to establish it, and the documentation you need for proof of domicile. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. I am currently living in the United States but they are requesting proof of US domicile but they're requesting proof of US domicile. Information on green cards for family members, who can qualify, preference categories and which forms to file. The first step in this processing is the creation of your case in our system.