"I know the rules very well, but I know that it's stacked against me by the establishment," Trump, 69, told media during a town hall.

He alleged that in some states despite him getting most of the votes his main Republican rival Ted Cruz is getting more delegates.

Similarly, he alleged that the Democrats have stacked rules against its presidential candidate Bernie Sanders so as to ensure that their favourite Hillary Clinton gets the nomination.

"It's stacked against him. It really is. It's stacked against him. In his case, it's super-delegates. In my case, it's the obvious. But it's stacked against him," he said.

Trump currently has 755 delegates, while Senator Ted Cruz has 545 delegates against the required 1,237 delegates to win the party's nomination.

Trump has now set his eyes on the presidential primary in New York where, as per the latest polls, he is leading by more than 40 points.

Trump said if elected he would make great deals on trade. He also exuded confidence that he would be able to get 1,237 delegates before the party's convention.

"I think we're going to do very well in New York. Some of the states around that we're going to be in next. I think we should do really well in California. I think we'll get to the 1,237," he said.

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