What began as an innocent Freedom of Information Act request by Judicial Watch, a D.C.-based public advocacy group promoting transparency in the executive branch, has now become a full criminal investigation, with Clinton as the likely target.
The basic facts are well-known, but the revealed nuances are important, as well. When the State Department responded to the Judicial Watch FOIA request by telling Judicial Watch that it had no emails from Clinton, Judicial Watch filed a lawsuit. When the State Department made the same representation to the court -- as incredible as it seemed at the time -- the judge accepted that representation, and the case was dismissed.
Then The New York Times revealed that Clinton used a private email server instead of the government's server for all of her work-related and personal emails during her four years as secretary of state. After that, the Judicial Watch FOIA case was reinstated, and then the judge in the case demanded of State that it produce Clinton's emails.