There was a lot of things that went on in the public sphere about this but what eventually convinced me there was nothing really there was testimony by Clapper/Lynch/Yates saying that no, they never saw any evidence of collusion. I'm sure someone will attack Taibbi but that does not take away that people that would know what went on said the below things under oath.
https://taibbi.substack.com/p/aaugh-a-brief-list-of-official-russia
“More than Circumstantial Evidence” for collision, Meet The Press, March 22, 2017. The ranking Democrat on the House Intelligence Committee, Adam Schiff, was asked by Chuck Todd on Meet the Press if he only had a circumstantial case for collusion against Donald Trump.
“Actually no, Chuck,” he said. “I can tell you that the case is more than that and I can't go into the particulars, but there is more than circumstantial evidence now.”
Schiff never had such evidence, and never explained what he meant. Moreover, in secret testimony, he would repeatedly seek confirmation of his public statements, and would repeatedly be shot down. In July of 2017, he asked former Director of National Intelligence James Clapper if such evidence existed. Clapper said he “never saw any direct empirical evidence that the Trump campaign or someone in it was plotting/conspiring with the Russians to meddle with the election.” Former Attorney General Loretta Lynch later said, “I don't recall anything being briefed up to me.” Former Deputy AG Sally Yates said of her knowledge of the state of the case at the time she left office in early 2017, “We were at the fact-gathering stage, not the concluding stage.”
The continued use of Adam Schiff as a reliable source, when he repeatedly proved unreliable, was one of the major problems with Russia coverage during this period.