A Client Threatened to Sue Me. What Should I Do? A Client Threatened to Sue Me. What Should I Do? It’s perhaps easiest to start with the one thing not to do when a client threatens to sue you: ignore them. Although a threat is a long way from an actual lawsuit, taking the threat seriously will allow you to prepare for whatever may follow. Even if you don’t believe your client’s claim has any merit or doubt their willingness to follow through with their threat, informing your professional liability insurer is an important first step in protecting yourself.