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. An affidavit of support, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents.This will include form I134 which is the affidavit of support in fiance visa cases. The Petitioner's signed and completed Form I-134 Affidavit of Support as proof that the U.S. Citizen can financially support the foreign national. How a U.S. citizen sponsoring a fiance can successfully fill in the form showing intended financial support. IMPORTANT — Read Instructions before completing this form. Or do I fill it out and sent to my fiance for the interview, or submit to the USCIS? Visa petitioner (US Citizen) will have to complete form I134. The petitioner may fill out an Affidavit of Support, Form I-134. S. Citizenship and Immigration Services (USCIS) Form I-864).