Part of my point is Trump was threatening the investigation of Hillary well before the election. We know how petty the last administration was. Could this be a tit for tat except the tat never materialized?
Part of the problem is there has to be an exact nature and specificity to the crime. Names, dates, places. In/undisputable facts. Strictly for having a prosecutorial case.
There is such obfuscation in matters relating to offenses by the obama admin such exactness is hard to nail down. Too much equivocation. To the point any conviction won't be overturned in an appellate court on a technicality. This will be the failure of the Mueller investigation, IMO. (There is something there but we can't prove it beyond an incontrovertible doubt)