If we end up in a civil war, does that mean election is cancelled?
This is the only ~~reliable~~ piece I can find online:
In order for a federal election to be postponed, Congress would have to enact an amendment to the 1845 federal law and the president would have to sign it. The chances of that occurring are very slim since the House of Representatives is controlled by Democrats, the Senate by the Republicans and the Executive Branch also by a Republican. Even if Congress and the president agreed on postponing an election, a judicial challenge would be likely.
From:
https://bbklaw.com/resources/postponing-a-presidential-election-and-the-law
Thank you, just found it: Republicans 220, Democrats 215.