If you are a U.S. citizen, you can sponsor, or bring your foreign fiancé(e) to the U.S. through a K-1 fiancé(e) visa to get married. The K-1 fiancé(e) visa is a single-entry visa where the two must get married within 90 days of entry. After marriage, your fiancé(e) can then apply to adjust his/her status to become a lawful permanent resident, or green card holder.