There’s actually lots of evidence of Trump-Russia collusion

 https://www.vox.com/2018/6/11/17438386/trump-russia-collusion

Republicans from Donald Trump on down have made “no collusion” a mantra. The term itself is ill-defined in this context; you won’t find it in the US code. But roughly speaking, the question is whether the campaign got involved with Russian agents who committed computer crimes to help Trump win the 2016 presidential election.

The verdict on this is unclear. But there is certainly plenty of evidence pointing toward collusion; what you would call “probable cause” in a legal context, or what a journalist might simply consider reason to continue investigating the story. And the investigating thus far, both by special counsel Mueller and by journalists working on the story, has been fruitful. The efforts have continued to turn up contacts between Trumpworld and Putinland, cover-ups, and dishonesty.