None of us can answer what is going to happen to him. He needs to speak to his lawyer, and you need to speak to him. You might also consider...

You have no basis to sue under these facts........

You can be fired for any, or no, reason. So yes.

Call the police...................................................

This is not a legal issue.......................

And you are asking a bunch of lawyers on the Internet? How would we know?

Scam. Block them....................................................

IMO it is legal for them to come to your house. It is also legal for you to invoke your rights and not speak to them.

This is a Q&A Forum. You have not asked a question.

I have never heard of any such suit. It would be a novel case. None of us can predict how it will go.