Donald Trump Urges His Supporters to Be on the Lookout for Cheating

The Republican nominee pleaded with supporters after saying if he doesn't win in Pennsylvania, it is because the system is rigged.
2:07 | 08/13/16

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Transcript for Donald Trump Urges His Supporters to Be on the Lookout for Cheating
He is telling his supporters to go out and vote on election day, but to not stop there. He wants them to be on the watch for cheating. This comes after trump said that if he does not win Pennsylvania, it's because the system is rigged. ABC's Mary Bruce has more. Reporter: Tonight Donald Trump with a message to Pennsylvania voters. If he loses there, it will be because Hillary Clinton played dirty. The only way we can lose in my opinion, I really mean this, Pennsylvania, is if cheating goes on. I really believe it. Reporter: Urging supporters not just to vote but to be on the lookout for cheating. Watch and study and make sure other people don't come in and vote five times. Reporter: And making the call for volunteers to help stop Hillary from rigging this election. Trump crying foul as he plummets in key battle ground states like Florida and North Carolina and showing signs of campaign fatigue. I want to get the hell out of here. I want to go home. Reporter: He's giving voters whiplash flip flopping on his claim the president and Clinton founded Isis. I said the founder of Isis. Obviously being sarcastic. Then, then -- but then not that sarcastic to be honest with you. I've been saying and keep saying somewhat sarcastically. He's the founder of Isis and I say she's the close second. Reporter: Clinton coming to her defense. This is the biggest load of bull I ever heard. Reporter: Dismissing claims Clinton lied when she said she never read classified e-mails on her private server as secretary of state. Mary, back in the news tonight that hack on top democrats. The fallout continues but we're learning that many big names in the party are being told to change their phone Numbers because of this breach? Reporter: Cecelia, even house democratic leader Nancy Pelosi is receiving text messages after what she's describing as a electronic watergate attack. She's changing her phone number and urging other house democrats to do the same. Cecelia. In Mexico a police officer

This transcript has been automatically generated and may not be 100% accurate.

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