Rhode Island Democrat Senator, Sheldon Whitehouse, has no evidence that there was any election-year collusion between Russia and the Trump campaign. None. We know this because, so far, such evidence has failed to materialize. That's not a debatable point.
Still, a lack of facts has never been enough to stop a Democrat who wants to insinuate foul play. If you can't prove something happened, why not imagine it. Pretending that something untoward was happening is just as good as proving it, right?