that's not how concessions work. it's just a gentleman's agreement. until the actual electoral college meets and votes, trump isn't locked in. once they do, however, even if it comes out there were shenanigans then it doesn't matter as their vote is who decides the president. it was how they rigged it for biden. they rigged it, then blanketed all media with "biden won" until the electors voted, at which case even when it did come out he cheated it was too late; he had been officially elected.
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