This report from the Center for American Progress highlights the dual challenges faced by lesbian, gay, bisexual, and transgender undocumented immigrants in securing legal immigration status in the United States. While some legal options such as asylum based on persecution in their home countries due to their sexual orientation or gender identity may be available, other legal options such as recognition of same-sex marriages are not.
The report estimates that there are at least 267,000 lesbian, gay, bisexual, and transgender undocumented immigrants residing in the U.S., and an estimated 32,300 binational same-sex couples who are denied immigration status protections and benefits because of the misnamed Defense of Marriage Act (currently being challenged in the U.S. Supreme Court).
The report includes the following useful infographic: