A Client has Threatened Me with a Lawsuit. What Should I Do? A Client has Threatened Me with a Lawsuit. What Should I Do? The one thing you don't want to do when a client threatens to sue you is to 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.