Not ca, this might be something mueller didn’t know about
Are forgetting he has access to all the top secret intel relating to election interference?
You really think Cambridge Analytica wasn't on the radar of US and/or allied intel and being closely monitored?
Hell, I would be surprised if US/British intel didn't have their own hidden camera recordings of those restaurant meetings like the ones Channel 4 aired.
EDIT: Just saw you said this is not CA. Disregard.
EDIT 2: The pic is from CA: Cambridge Analytica’s parent company said its hackers could control the internet