DOJ Secretly Subpoenaed Congressional Staffers Probing Russia Investigation
- DOJ subpoenaed private records of congressional staffers investigating Russia probe
- Subpoenas targeted staffers on both House and Senate oversight committees
- Subpoenas were issued in 2017, before Rosenstein threatened similar action
- Targeting legislative branch raises constitutional concerns about separation of powers
- House and Senate committees should investigate DOJ's actions and rationale
