The Republican party candidate made the sensational claims to voters at a rally in Ohio on Monday night.
“I’m afraid the election’s going to be rigged. I have to be honest,” he said bluntly.
He also slammed left-winger Bernie Sanders for throwing his weight behind Mrs Clinton, his rival
for the Democratic nomination.
“He made a bad deal – he should not have made a deal”, he said. “Believe me, he has buyer’s remorse. His people are angry at him and they should be.
“If he would have just not done anything, just go home, go to sleep, relax, he would’ve been a hero.
“But he made a deal with the devil. She’s the devil. He made a deal with the devil.”
Speaking on Monday, CNN reports that Trump claimed that he had heard “more and more” rumours that the US election result will be fixed.