Upvote:1
What your husband may be able to do will be set out in the refusal letter and, generally, cite the section of applicable US law (and not much more, so it may leave you unsure of how to proceed).
Your husband can re-apply and, without knowing under which section he was denied, itβs best that you refer to the State Department guidance. In most cases, the recourse is to overcome the objections raised, e.g., incomplete application or supporting documents (section 221(g) of INA), qualifications and immigrant intent (section 214(b) of INA).