“How long will the investigation into the 2016 cyber intrusion into the Democratic National Committee servers remain open and ongoing? Perhaps forever. Because that’s how long the Department of Justice needs to thwart Congressional oversight of the embarrassing details of the dubious origins of the investigation. See the way DOJ cited the “ongoing” nature of the investigation to block Congressional Oversight here, here, here, and here to name just a few examples.“
https://thefederalist.com/2018/07/12/the-russia-investigation-is-a-puzzle-designed-never-to-be-solved/