If you & your husband live in an "at will" employment state, an employer can hire and fire at will, as long as the reasons are not illegal (discrimination, for example) and in some states, as long as they followed their company procedure. Your husband as the former employee should be the one questioning the circumstances of his termination, in my opinmion. I'd suggest he contact the parties responsible for his termination, preferably in writing, to have the reasons stated. Check with your local labor board first to verify your state's current employment statutes and then if you feel you have sufficient reason to pursue a wrongful termination suit, contact an employment attorney. You need to be aware (as I'm sure the attorney will advise you) that it's not easy to prevail in this type of suit, depending on where you live, can take several years to resolve and can get quite expensive.

This isn't the time to "wade in" with your husband's former employer, in my opinion. It may be possible for him to arrange for a meeting with the parties (I'd strongly suggest there be at least 3 people present & he take notes during the discussion. I'd also suggest he request a formal notice of termination at that time as well.) Based on that outcome, the 2 of you can then decide whether or not to proceed. I've found it usually helps to get as many facts as you can in hand before making a decision .. in this case, it certainly couldn't hurt. Just a thought.

Good luck.