So, the law that covers what happens if there’s neither a POTUS or a VP specifically says that whoever ends up taking over acts as President til the end of the then-current term. There are some scenarios where someone could end up bumping someone else out, but there is no provision for calling a special election under any circumstances.
Interestingly, though, prior to the 1947 Succession Act, the previous ones, which were passed in 1792 and 1886, DID state that, if such a vacancy happened prior to the start of the last year of a presidential term, there WOULD be a special election for a new POTUS and VP, who would then start a new, four-year term after being elected. That provision was obviously never enacted, and the current law from 1947 specifically and clearly states there will NOT be a special election.
So, we’d have to revert to pre-1947 law and have both Biden and Harris out of commission for a special election to be called.
And it has to be before 2023…? I think?
I found this on Quora:
So, we’d have to revert to pre-1947 law and have both Biden and Harris out of commission for a special election to be called. And it has to be before 2023…? I think?