They are no more going to impeach Trump than they would’ve Obama, and for the same reason. No one wants a civil war. The last one was horrific in the age of one shot and reload muskets with limited range. Imagine one in the time of automatic, semi-automatic rifles, pistols and shotguns, much less anti-tank weapons, modern artillery and explosives. Even Nancy Pelosi and Chuck Schumer aren’t that stupid.
If would also be a war without fronts or territory.
There are no Republican states or Democrat states. The best you can do in most places is have the cities against the suburbs.