Scott Adams has consistently said that 'if the SCOTUS has to decide between accepting illegality and civil war it will accept the illegality'
Still, perhaps that is pessimistic. After all, a PA state court just found the PA election 'unconstitutional' and said the PA state legislature has the power to appoint electors.
One of the follow up to Barne's comment is that the state legislature could decide to award the electors to whichever candidate won the most counties on the grounds that Biden's popular vote lead is dubious as his lackeys stuffed more ballots in DNC hive cities than that lead.
https://archive.vn/C3ANO
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https://edition.cnn.com/election/2020/results/state/pennsylvania
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Incidentally, this may be an ex post facto justification but suppose Red states passed laws making their electoral college votes go to the candidate that won the most counties rather than the one who got the most votes. That would make it much harder for this sort of fraud to work because it would require the Democrats to cheat in all counties, not just in their wretched hive cities of scum and villainy.