This Is Where I'd Put My Trophy If I Had One

Oh, he was out to get Trump. If he weren't, he wouldn't have done this for 2 straight years.

He was out to investigate Russian meddling. The possibility of collusion came up, so he investigated that and other related issues.
Proof was found of meddling, and we've yet to do anything to prevent it in the future, something which they are capable of doing even worse damage than spreading propaganda.