As far as this being a small matter.   Let's assume, for a minute, there was no active collusion with Russia and give Trump the benefit of the doubt.  The problem still is, that he and his staff have lied repetitively about this "small matter".  And since the American public can't trust them on a small matter, why would they trust the administration's motives on a large matter, like health care or tax reform.  The Trump administration has lost so much credibility that it is losing the ability to affect the changes it wants.  As much as the Republicans would like this to go away, the issue is "trust", and that issue won't go away.