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1 US citizenship!  The first step in the K-1 visa process is for the US citizen fiancÃ©(e) to file Form I-129F, Petition for Alien FiancÃ©(e). Form I-129F is to be filed on behalf of the foreign citizen fiancÃ©(e) applicant. The purpose of this USCIS form is to show evidence of your relationship and also to provide an Affidavit of Support.
The K1 Fiance Visa Process. 1  The I-129 petition process. 2  USCIS I-129 Petition Relationship Proof. 3  Getting a UK Police Certificate for Immigration Purposes. 4  The Fiance Visa Processing and Wait Time. 5  US Vaccination Requirements for the medical exam. 6  My K1 Fiance Visa Medical Exam. 7  K1 Proof of relationship.