They already have checked some, and can continue to check again with notice.
Don't the democrats want them checked ? Why ?
What if Russians were mailing in ballots for Trump ? How would they know ?
Of all the problems the country is facing right now, this is the democrat's priority ? They are supposed to be leading us. Why aren't they letting the republicans (that aren't in leadership position) waste their time chasing ghosts in the most secure and transparent election ever, while they show us how good at leading they are ?