Well, the OP of this thread for one. Not to mention at least a few other Trump supporters on this board.
I have a pretty even split of Republicans/Conservatives and Democrats/Liberals when it comes to Facebook friends and people I follow on Twitter. The liberals bitch but they mostly come out in force where there is something in the news at that moment, like when the Parkland school shooting happened. However, the Republicans are a different story. Every single day at least a few of them post some kind of anti-Obama/anti-Hillary/anti-liberal stuff and not a week goes by that at least one of them doesn't talk about the coming civil war.
I don't doubt that leftist groups have in the past and may even now be calling for it, but in my experience, right now, the only people I see talking about a civil war are Republicans/conservatives.
Here's Alex Jones talking about how there should be a civil war aginst liberals. While he is a crazy person, he is a crazy person the POTUS actually listens to which makes him somewhat relevant.
Again, in the end, who is talking about or calling for it doesn't really matter as it is never going to happen.