I don’t know what they were meeting about and neither do you. You are the one making accusations of collusion: you have the burden of proof.
You appear to have no evidence to cite, and more basically, no assertions what this collusion was supposed to be about.
It was a year ago that Trump publicly wished the Russians would release Hillary’s 30,000 emails. Is this your collusion?
Donald Trump Calls on Russia to Find Hillary Clinton's Missing Emails
DORAL, Fla. - Donald J. Trump said on Wednesday that he hoped Russian intelligence services had successfully hacked…
Trump’s wishes are not collusion. Going to a meeting Russians is not collusion. Neither is making a business deal or having lunch. Neither is receiving a story with dirt on your electoral opponent. Campaigns receive lots of those.
So if those are your elements of your collusion, you’ve got nothing.
You need more, a lot more. You need to start with allegations sufficiently specific that they are capable of being proved or disproved by evidence.