When Aimen Mir left his job as the most senior career official at the Committee on Foreign Investment in the United States (CFIUS) in 2018, he was a hot commodity. A number of law firms were eager for his insights into an agency that has become central to the U.S.-China economic relationship. Lawyers with Mir’s background at CFIUS, once seen as a bureaucratic backwater, haven't always been in such high demand. But as concern over Chinese acquisitions in the United States has grown, the work