I'm no tRump fan. I n fact I a far from it and I feel he has real mental issues but I'm not a shrink so no is concerned with my diagnosis.
Is he guilty of treason? This issue should be investigated but at this point he is guilty of nothing except of being a damn fool. Also consider how difficult it is to prove someone to be guilty of treason.
Another thought, impeachment is one thing but conviction is another and without a conviction there is no constitutional grounds to remove him but that does not mean we should not keep our eyes and ears open to everything about him.
There was far less information available on Nixon over Watergate at this point, there is more than enough to begin a serious investigation. There should have been one last year, even Congressional republican leaders were aware of the Trump-Putin link well before the last election but chose to sit on it for fears it would hurt the party.
Trump isn't just an indictment on himself but such a self-centered political movement that has put the entire nation at risk. This is on republicans as much as it is on trump and Putin.