For there to be a civil war, both sides need an army. The US president will have the US army, and the other side might as well have nerf guns. The civil war would last an afternoon.
If there's going to be anything, it's an increase in domestic terrorism.
It would be a guerilla collective against a conventional force that's consistently failed against guerilla tactics.
There's no way to know how long it'd last or how it'd impact politics, but targeted acts of terrorism in cities would likely become a more common tragedy. It would pretty much gaurantee US states increasing their police forces and personal rights eroding, and I'm not looking forward to that.
No, these guys are way less organized than last time and Donald Trump is getting fucked in court still. I think its less likely now than it was 4 years ago. The GOP is fracturing and losing steam. Senators and governors are still a threat but not in the civil war type of way I don't think.
For reference, they're talking about this monstrosity of a plan Trump has set up for if he takes power in November. Don't actually vote against Biden even if you support Palestine. Shit's unreal. Shit's very clear and obvious .50 cal territory.