If you are coming to the United States on a temporary visa, you may need to prove financial support. A sponsor can file the I-134 form.This form is a sworn statement of your ability to financially support your visitor(s) during their stay. Completing and signing Form I-864 makes you the sponsor. DuPage County immigration attorneys helping clients with affidavits of support and medical examinations for immigrant visas. Submit a completed Affidavit of Support form. Sponsors who are US citizens and permanent residents should complete the USCIS Form I-134 Affidavit of Support. Individuals immigrating through most family-based, and some employment-based,1 visa petitions are required to submit an Affidavit of Support on. Immigration and nationality law attorney helps individuals throughout Illinois and prepare their I864 forms. Consular officers do have guidance material that they should consider in granting or denying a visa.