Read the first half of the Mueller report. It explains how large Russia's interference was and that Trump people were involved. That of course resulted in Trumpies being indicted and some going to jail' He also showed 10 incidents of Trump obstruction. He said it was not the justice departments power to deal with a sitting president. He made it clear that the proper venue was congress. That is where it is being investigated now.
We only need to read Page 173 of volume I:
Mueller Report; Page 173 V I: Ultimately, the investigation did not establish that the Campaign coordinated or conspired with the Russian government in its election-interference activities.