again, there's no evidence of a crime by team trump.
It would be nice to know exactly what Natalia Veselnitskaya's goal was at that meeting, not least because if you click on her name in your link and go to her wiki page, you find that she met with the co-founder of Fusion GPS both before and after the trump tower meeting.
Also on or around June 9, prior to and following the Trump Tower meeting, Veselnitskaya met with Fusion GPS co-founder Glenn R. Simpson, ostensibly related to hearings that involved their mutual client Denis Katsyv, concerning charges of Russian tax fraud and money laundering originally uncovered by Magnitsky. The Simpson-Veselnitskaya meetings were denied by Veselnitskaya herself but confirmed by Simpson's lawyer. This has led to speculation from Trump allies linking the meetings to Fusion GPS's concurrent work assembling opposition research against then-candidate Trump.
Fusion GPS was the "opposition research" behind the fake "golden showers" dossier put together by a former british intelligence officer (christopher steele) and "elements of russian intelligence", an effort funded by Hillary and DOJ/FBI, with the dossier used to obtain the FISA warrants to spy on team trump.
If you want collusion with the russians (and british), start there, but half the bad actors are working for the mueller investigation
The goal here has always been to open Pandora's Box, to use the probe as an excuse to look into anything and everything in Trump's past in the hope of finding a crime. That's what happened with manafort: they kicked his door down at 4am and went through all his papers to find evidence of wrongdoing completely unconnected to trump and the trump campaign and committed long before the 2016 election. The fourth amendment is supposed to prevent things like that from happening.
Gun-wielding FBI agents busted into Manafort’s home while he was asleep
Or there's the process crime, which is how they "fucked Flynn" (to borrow mccabe's expression). You interrogate Trump for 6, 7, 8 hours and ask him random questions about things that happened long ago. Although there's no underlying crime, you charge him with perjury/obstruction/lying to the FBI if he misspeaks/misremembers, or interprets events differently to you. If Comey's testimony to congress is to be believed, flynn didn't even lie to the FBI, but they charged him with lying anyway
Flynn forced to sell his house to pay his legal bills
Any crimes connected to the campaign seem to have been unearthed by the congressional hearings not by mueller, because half of the bad actors are working for the mueller investigation.
The commission needs to look at who exactly put the fake dossier together (russian intelligence?), whether the DNC "hack" was the russians or, as the evidence suggests, a disgruntled DNC employee walking out the door with a memory stick in his pocket, whether the FBI/DOJ lied to get the FISA warrants, who exactly was Carter Page and was he working for the FBI. And was there as conspiracy within the obama administration to create a false narrative to enable trump to be removed from office.
None of which mueller seems to be interested in.