Certification of electors by Congress occurs on a state-by-state basis. If objections to enough states' electors are sustained that no person has 270 electoral votes, then a contingent election would be held under the terms of 12th amendment.
If Congress hasn't elected a president or vice president by January 20th then the House Speaker would serve as acting president until they do.
I believe there is some ambiguity as to whether the threshold to win might also decline from 270 as EV are rejected by congress? Any rejected EV may also come out of the denominator.
That doesn't seem right. It could be but it doesn't seem right. Its not like there is any case law about it.
