I can see the Trump fans: Biological attack by ANTIFA!!!
Maybe Trump simply did not want to have another debate because his only available tactic failed?
And what happens if one candidate dies close to election? Is there a second in position that takes over for the Reps?
And what happens if Trump wins but has late damage from it that does theoretically not prevent him from doing his job but effectivly does? Like the fatigue syndrom?
It would likely be better for the world if he doesn't do anything, but I am wondering about the legal side. Can the senate (or has to) kick him out? What when the Reps don't do it?
The 25th amendment provides a clear path for the senate to remove the President - permanently or temporarily - should he prove mentally unable to continue his duties. However, its on the senate to act, and to date the GOP has served as a defensive shield around DJT. In that case Pence would become President.
Should a candidate die before the electoral college meets, the electors (remember - they actually vote for the President, not the people) can vote for whomever they wish. This actually happened once in our history, when Grant was elected (Challenger Greenley died).
If a candidate dies before the general election, the party can nominate whomever they wish (and have rules in place for doing so). Ballots already cast automatically (I believe) then count for the new nominee.
Should an elected president die before assuming power it becomes more complicated. Many interpret the constitution as saying the rules of succession apply, so the VP-elect will then become the Prez-elect (e.g. Harris or Pence). But it would almost certainly wind up in front of SCOTUS.