And today, the Constitution — in either its 1789 or 1877 form — has broken. There is a President who claims to be above the law, and there is no mechanism in place which can contradict him. If this persists, the Constitution is no longer meaningful except as history; if it does not persist, the Constitution must be changed.
What this means is that today, it’s hard to imagine anything which would cause Paul Ryan to call for an impeachment vote. Trump’s statement in early 2016 that he “could stand in the middle of 5th Avenue and shoot somebody and… wouldn’t lose voters” has turned out to be prescient: today, if he shot someone in the street, we would be treated to the same dance we’ve seen with every previous malfeasance of the past six months. (First Presidential spokespeople would deny it; then, Democratic members of Congress would decry it as clearly the last straw, while a few Republicans would say it was “clearly concerning;” then, talking heads explaining why it’s a non-story, until Trump himself, most likely, would publicly tweet bragging about having done it; then, the same Republican Congresspeople explaining how it was technically legal and within the purview of the President; then, the next news story.)