It was probably the russians and they were probably gleaning all the DMs off of accounts for years. This was just sabotaging the rudder as a calling card, as Tim puts it.
Now think N-dimensionally. We can't submit evidence into court collected via spying, but we can investigate russian hacking efforts and what they got on our politicians.
My theory, at least. It doesn't have to be russians - it would just make the media orgasm on screen trying to talk about it. So of course they wouldn't be able to help themselves and they also would not be thinking, at all, of what happens afterward.
That reports the russians got compromising intel would allow us to ask our intelligence agencies if they could verify the report… We can… Here's the child eating video. OMGWTF why didn't you prosecute? Due process, can't originate evidence.
Leftists go insane and drag democrats into the street to rape them to death with dildos. Nothing of value was lost, deploy aerosol sedatives on irate leftist mobs, hold extensive debriefs to help them cope with reality.
I jest to some degree, but I think the idea comes across.