A PMHNP is treating a 30-year-old man with antisocial personality disorder and intermittent explosive disorder. During a session, the patient states with apparent calm and specificity, 'When my custody hearing is over next Tuesday, I'm going to make my ex-wife pay. I've been thinking about how to do it and I know where she works.' He describes a detailed plan to confront her at her workplace. He has two prior domestic violence convictions involving this same individual. The PMHNP practices in a state with a mandatory duty-to-warn statute. Which of the following is the most appropriate course of action?