Top secret

In the news today it was announced that some of Hilary Clinton’s emails were so top secret that no one will be allowed to look at them. That sounds like a line from a standup comic. I want to know who already broke the law by sneaking a peek. On a serious note does that mean that congress, which is responsible for oversight, is not allowed to see these emails and if so how are they to carry out their responsibilities. There is a part of this story that is missing.