Comment by rayiner

The K visa actually proves my point, because someone on a K visa (by itself) isn’t eligible for adjustment of status at all! The K visa only allows admission for purposes of getting married within 90 days.

Under 8 USC 1255(d), the AG can’t adjust the status of someone here on a K visa: https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim.... If you don’t get married, you have to leave.

What entitles alien spouses to petition for permanent residency is not the K1 visa, but section 1154: https://uscode.house.gov/view.xhtml?req=granuleid:USC-prelim.... So, for example, the citizen could marry their fiancé in the fiance’s home country.[1] And they’d use 1154 to petition for permanent residency. The K1 visa just allows the marriage to happen in the U.S. but is unrelated to the ultimate basis for permanent residency.

[1] Our family friend did this. We set him up with the daughter of our next-door neighbor in Bangladesh. They had a wedding over the phone with him in the U.S. and her in Bangladesh. Then she came over on an 1154 petition.