When same-sex marriage became a reality in some countries, the state of Massachusetts, and for a short period of time in California, the big question for many was whether a U.S. citizen or legal permanent resident who married a person of the same sex would be deemed to be legally married in the United States for federal immigration law purposes.
The question arose as to whether a U.S. citizen or legal permanent resident would be able to marry in one of these jurisdictions and thereby petition the U.S. Citizenship and Immigration Services to have his or her spouse immigrate as an alien relative. The answer to this question at present is “no”.
If federal courts are given the opportunity to rule on a challenge to a denial of an I-130 petition submitted by a same-sex couple, they may do little more than cite the Defense of Marriage Act (DOMA). DOMA provides in part, that a marriage is defined as a union between a man and a woman for all federal law purposes. At present the U.S. government is under no legal obligation to give effect to a foreign marriage between persons of the same sex.
Visa Lawyer Blog

