I agree.
If not, the House has to replace Harris. The replacement then replaces Biden and the House has to replace the replacement.
Unprecedented in history
More likely is that Biden has deteriorated to such a bad state that Harris will take over.
“Unprecedented in history.”
Actually, it is precedented:
Nixon/Agnew——- Agnew resigns
Nixon/???———- No VP, Ford nominated
Nixon/Ford——— then confirmed as VP by House/Senate
Ford/???———- Nixon resigns, Ford now POTUS, no VP
Ford/Rockefeller—— Rockefeller nominated as VP, confirmed by House/Senate
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