Transcript for Ballot Watch: Incorrect ballots sent in battleground states
Now to tonight's ballad watch. And news of the latest mishap with some voters being mailed incorrect ballots this time in Pennsylvania's Allegheny County the second largest in the seat which includes Pittsburgh. County election officials there today announced that a technical error by the company contracted to handle printing correlating and mailing of ballots resulted in nearly. 30000 voters receiving incorrect balance the company says it happened because of an error in how some ballots were matched to voters before they were printed. Officials say the issue was identified and corrected the very same day in the new valves are expected to be delivered next week which should leave those voters not. Two weeks return their ballots in Pennsylvania postmarked by Election Day. Is of course isn't the first word of the ballot printing error in 20/20 it's happening in new York and LA as wells. Last weekend Ohio's Franklin County where a faulty Skinner cause nearly 50000. Absentee ballots to be sent the wrong voters. Or roughly 20% of absentee ballots in the State's largest county that included Columbus. President trump latched on to that news tweeting last Friday. Deep deep thousand Ohio voters getting wrong absentee ballots out of control a rigged election. But the Franklin County board of elections push right back tweeting Mr. President it certainly was a serious mistake but a serious mistake that we're working hard to make right. Our board is bipartisan and our elections are fair and every vote. Will be counted mob of faulty ballots mailed out in some locations have certainly cause some concern. It is worth noting that they still represent a small fraction of the millions of balancing mailed out this year. And election officials in both Ohio and Pennsylvania emphasizes security systems are in place to track balanced and make sure only one ballot per voter he's counted.
This transcript has been automatically generated and may not be 100% accurate.