ROCHESTER, N.Y. — Republican presidential candidate Donald Trump is blasting the way the country chooses presidential party nominees as “corrupt” and “crooked” as he grapples with the potential of a brokered convention that he risks losing.

Speaking to thousands packed in a frigid airport hangar in western New York on Sunday, Trump ripped the byzantine fight over delegates at the heart of his party’s nominating process. He argued anew that the person who wins the most votes in the primary process should automatically be the GOP nominee.

“What they’re trying to do is subvert the movement with crooked shenanigans,” said Trump, comparing his woes to those of Bernie Sanders, who is winning states but still far behind Democratic front-runner Hillary Clinton in the race for delegates that decide party nominations.

“We should have won it a long time ago,” Trump said. “But, you know, we keep losing where we’re winning.”

Trump was coming to terms with the political reality of candidates chasing delegates ahead of their nominating convention, and now he’s shifting his focus to developing a strategy akin to the one rival Ted Cruz has been pursuing for months.