Senate Judiciary Committee Chair Chuck Grassley (R-IA) asked the Justice Department’s Antitrust Division to conduct a “robust analysis” of proposed mergers between Cigna Corp. and Express Scripts, and CVS Health and Aetna. Grassley cites rising drug prices as the reason for his concern about the mergers. Grassley said the mergers could either give plans and pharmacy benefit managers more power to control drug prices or create barriers to competition in both the health insurance and pharmacy benefit manager sectors. “As...