Could you sue your employer for not taking action against a group of harassing co wor

My husband works for a large hospital as a surgical tech, there is a group of nurses that harass him daily. It is not in a sexual manner. He has been reprimanded for missing work which the only reason he is missing work is because the women are intolerable, they question things like his septic technique in a non sterile surgery to their supervisor, try to place blame on him for missing or incorrectly marked specimens when he was not even working on them, and now the latest... these women got together over the weekend to call his boss to alert her of my husbands threat to "go postal" and commit suicide. Which was taken entirely out of context because they were having a conversation about the man that killed his family over losing his job at Kaiser. Now he has been place on addministrative paid leave pending a psych evaluation and investigation. For the last 2 years these women have done nothing but chip away at his self esteem and play around with his liveliyhood. Is there anything we can do?

How do you take a comment about "going postal" out of context?

Has he ever expressed his concerns to his superiors?

If he is mentally fit, once the evaluation is completed, his complaints about his coworkers should be given more credence. Perhaps he can use this time away from work to regroup, relax and perhaps even find a more suitable job.