Iowa Attorney General Tom Miller today joined two joint federal-state antitrust lawsuits seeking to block two proposed mergers involving four of the nation’s largest health insurance companies. The lawsuits allege that Aetna Inc.’s proposed acquisition of Humana Inc., and Anthem Inc.’s proposed acquisition of Cigna Corp., would increase concentration and harm competition in Iowa and across the country. “Our office joined these two lawsuits because of our concerns that reduced competition in the health care marketplace will harm consumers,” Miller said in a press release. “We are troubled with the prospect that these mergers would substantially consolidate the industry, resulting in potentially higher premiums and reduced innovation.”