Republican presidential front-runner Donald TrumpDonald John TrumpTrump endorses former White House physician Ronny Jackson for Congress Newly released emails reveal officials' panic over loss of credibility after Trump's Dorian claims Lindsey Graham thanks Trump, bemoans 'never-ending bull----' at South Carolina rally  MORE lashed out against the Republican Party on Tuesday, saying that its nomination process is “rigged” against him.

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“The RNC, the Republican National Committee, should be ashamed of themselves for allowing this kind of crap to happen,” he said at a rally in Rome, N.Y.

Trump blasted what he saw as an effort to steal the nomination away from him despite his lead in votes and delegates.

“You know the system folks is rigged. It’s a rigged system. Now you have to understand, I’m not talking about the states that I won, those are OK,” he said. 

The Republican front-runner has been incensed about his rival Ted CruzRafael (Ted) Edward CruzGOP chairwoman suggests RNC plans to get 'litigious' over push for national popular vote The Hill's Campaign Report: Sanders top target at CPAC Bloomberg campaign manager says they have considered naming running mate during primaries MORE winning all of Colorado’s 34 delegates as a result of the state party’s decision to hold a convention where grassroots activists elect the delegates directly.

Trump and his supporters have taken that as a sign that the party is attempting to steal the nomination from him.

“When you look at Colorado — and people can say ‘Oh well that’s the way the game is played,’ well look, they should have had an election,” Trump said. “That system is set up so that the crooked politicians can make sure that they get somebody in that’s not part of what we’re doing.”

“But I’m in first place by a lot, millions and millions of votes. But that doesn’t count, you noticed? Nobody even talks about votes,” he added.