Indeed. The emails in question can likely be obtained via a FOIA request, as well, with only matters of national security redacted. They won't ask your lawyer, either.
I fully expect that anything that is electronic is fair game for the government. The government wants to break into your phone/email/home computer, it will figure out how to do it. It is the reality of the modern age. Politicians always ride that high horse and assume they are immune to all the transparency they expect from the average citizen(peons) and normally they get away with it. It is funny that this precedent is extending into politics. Maybe next up is that they get the same retirement and healthcare options as everybody else.