The hacking of the Office of Personnel Management's security clearance database is just the latest blow to the government's background-check system. Two years ago, a contractor with a security clearance shot a dozen colleagues at the Washington Navy Yard. Only later did the government learn he had a history of mental illness. Sen. Jon Tester (D-Mont.) has spent years advocating for reforms to the security-clearance process. He joined Emily Kopp on the Federal Drive to discuss his latest strategy — to pass an amendment to the National Defense Authorization Act that would force agencies to better manage the system.