My disabled son (US citizen) who gets SSI benefits, has married a Bangladeshi girl and now is seeking her permanent entry to US. What needs to be done

The fact the Bangladesh is on the list of 75 countries for which immigrant visas cannot be issued does not mean that a case cannot be processed up to the interview stage. In a normal case, processing takes approximately 1 ½-2 years before reaching the interview stage. So your son could file the I-130 petition for alien relative, and assuming that it is approved, his wife can begin the consular process in which your financial support will be relevant. Hopefully, by the time that her case reaches the interview stage, the travel ban will no longer be in existence. If it is, she and your son would have to look at any way under which it could be waived. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.

Your son should retain an immigration attorney to handle the case from start to finish. There are numerous forms and supporting documents involved, and they must be completed with meticulous accuracy. Some of us offer an affordable flat fee for start to finish representation with no hidden fees. An attorney in any state can assist your son with this process.