K1 visa (also known as the Fiancé(e) Visa)
If you are a United States citizen and you are engaged to a foreign national, you can petition your fiancé(e) to come to the U.S. to marry. Your fiancé(e) will enter the United States with a K1 visa stamp on the passport. The K1 visa is commonly known as a fiancé(e) Visa.
A fiancé(e) visa allows foreign nationals to enter the U.S. in order to marry their U.S. citizen fiancé(e). The fiancé(e) visa is a non-immigrant visa that lasts for a period of 90 days. This means that upon entry, the fiancé(e) and the U.S. citizen have 90 days to get married. After the marriage, the foreign national can apply for Adjustment of Status and get a green card.
In order to apply for a fiancé visa, the couple must: (a) have the intention to marry within the 90-day visa period, and (b) the couple must have met each other in person at least one time within the past two years before submitting the petition. Immigration law says that the burden is on the petitioner to prove these legal requirements. The petition must include enough evidence to satisfy the legal requirements.