Oh, I think he is concerned -- maybe to the point of being terrified. Trump, like the rest of us, really doesn't know what, if anything Mueller and those NY prosecutors have that might incriminate him in some wrongdoing. Seems to me the closer these guys may be getting to an endgame, the more Trump lashes out at them. It's a defense mechanism for him.
Would Trump's followers rise up if he was impeached? Yes, I think they would -- at least some of them. We talk about Antifa and all those other violent terrorists, but there are fanatics on the Trump side as well. They would do anything to defend and protect their hero.
Civil war is coming. It's been simmering for some time. The question is when it will happen and what event will precipitate it.