"Collusion" is not the only crime we're discussing here, nor is it the only thing to be investigated or proven.
The entire IC agrees that Russia interfered with the election, and our president seems uninterested in getting to the bottom of it. In fact, he may have obstructed justice to interefere with the IC probe into Russian interference.
Trump's behavior is not consistent with a person who has nothing to hide. He calls "fake news" on an issue that the IC has *high* confidence in.
He has multiple illicit ties to Russian banks and oligarchs, and so do his associates.
He speaks very favorably about Russia and Putin, while the rest of the government, military, and congressional staff agree that Russia is *not* our friend, nor should they be.
His idiot sons bragged about having access to Russian funds five years ago.
He and his staff have continually been exposed as liars about repeated Russian contacts, including the AG, former campaign manager, and his idiot son-in-law.
You can't call a game before it's won. The investigation is still ongoing.