Tell us, what might you consider "hard evidence"? A document between Trump and Putin signed in blood fingerprints?
There is the thought out there that Mueller and his team are now searching for evidence which is outside of the Russia collusion narrative because the evidence for the collusion is weak at best. Basically meaning they don't have any real evidence to prove the initial narrative.
We will see but I don't see how you can scream from the hilltops about Russia collusion and then try to remove trump on an unrelated charge for events that transpired before the election. That will not go over well.