Donald Trump suggested on Monday that the November election may be “rigged” against him.

“I’m afraid the election is going be rigged, I have to be honest,” Trump said at a town hall in Columbus, Ohio.

The Republican nominee pointed to Bernie Sanders’ unsuccessful Democratic primary campaign as an example of elections being rigged. Trump has frequently claimed that Hillary Clinton only won the primary because national Democrats intervened on her behalf.

At his Monday campaign rally, Trump added that the Republican Party could not stop him in the GOP primary because of the margin of victory he racked up.

“Poor Bernie. He looks so upset. You know what, he shouldn’t have made a deal,” Trump said, referring to Sanders’ endorsement of Clinton. “I think my side was rigged if I didn’t win by massive landslides.”

Trump’s past claims about the Democratic primary were based on leaked Democratic National Committee emails that suggested party officials opposed Sanders’ continued campaign in the late stages of the primary. It wasn’t clear what fed his speculation about either the Republican primary or upcoming general election.