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. Petitioner: The petitioner must complete an Affidavit of Support Form I-864.The person who signs the Affidavit of Support is also called the "sponsor. An affidavit of support, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents. The purpose of the document is for a sponsor to fill out an affidavit of support form to sponsor an immigrant's application for permanent residency in the US. The Traffic clerk's offices are open daily Monday through Friday between the hours of am and pm The purpose of the Affidavit is to assist consular officers in determining whether a visa applicant will have adequate means of financial support in the US. Applies to All Applicants: This form is for all applicants who have a U.S. sponsor who will support their studies financially.