He literally says 'we don't want bloodshed, but hey, the constitution says you cannot secede, so there will be bloodshed if you try to'.
We have several secessionist movements around the world: Canada, Spain, UK (Scotland/Northern Ireland), EU (Brexit) - to name just a few.
Literally the 'land of the free', a new country, with a lot of devolved power ... but 'if you try to leave we're going to invade you'. It seems really inconsistent with democratic principles.
Though histories and legalities are quite different, I was pretty shocked by his stark position.
His tone is not aggressive, but his position is pretty hardcore absolutist.