100,000 plus Republican voters came to the Pennsylvania polls on election day and were forced to cast provisional ballots, nearly all of which were rejected, because election officials said their votes had already been cast by mail. This contention is one of the bases for one of the Trump lawsuits.
https://justthenews.com/politics-policy/elections/mathematics-prof-says-sworn-statement-many-56000-gop-ballots-pa-may-be