Donald Trump has warned of "foul play" at the polls after votes are reportedly being switched from Republican to Democrat.
He is urging his supporters to look out for signs of a rigged election in certain areas, as explained in a video by LifeZette.
CBS Pittsburgh reported that Americans are encountering problems in placing their vote.
"Every time I would push a candidate for the Republican party, it would come up for the Democratic candidate," David Drane told CBS Pittsburgh.
Clinton Township election judges in Butler County confirmed there were issues with two of their eight automated voting machines. They said most of the issues came when people tried to vote straight party ticket.
Bobbie Lee Hawranko said he pushed Trump three times and it still wouldn't stick.
"So then I called one of the women that were working the polls over. And she said you must be doing it wrong. She did it three times and it defaulted to Hillary every time."