No, its over a legitimate suspicion of his collusion with Russia. I'm not sure the claim is true even partially but I think given certain people around Trump there's a legitimate suspicion. Btw ten years ago the GOP was trying to do the same thing over blow job. Sorry, "perjury".
That doesn't mean I like it. Dems hide behind the Russia investigation a bit too much and regardless of that they should not take the example of the GOP and play obstructionist, they should try to find whatever common ground they can with Trump to get something done. So I do think the GOP started the escalation under Clinton and ramped it up under Obama but that's no excuse for some of the behavior of some Democrats and leftists.
EDIT: But I will say that Bill Clinton tarnished the dignity of the office with his antics and in a way, however small, paved the way for Trump.