If POTUS goes, then VP automatically ascends. We don't want Harris to ascend, so remove her first. Biden won't get a nominee replacement approved, so VP remains vacant. Then remove Biden. Boom, now a vacany for POTUS and without a VP, next up is Speaker.
If POTUS goes, then VP automatically ascends. We don't want Harris to ascend, so remove her first. Biden won't get a nominee replacement approved, so VP remains vacant. Then remove Biden. Boom, now a vacany for POTUS and without a VP, next up is Speaker.