RNC chief fires back: ‘Nothing mysterious’ about primary process
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Republican National Committee (RNC) Chairman Reince Priebus late Monday responded to criticism from GOP presidential front-runner Donald TrumpDonald TrumpJan. 6 panel plans to subpoena Trump lawyer who advised on how to overturn election Texans chairman apologizes for 'China virus' remark Biden invokes Trump in bid to boost McAuliffe ahead of Election Day MORE, saying there’s “nothing mysterious” about the primary process.

“The rules were set last year,” Preibus said in a tweet. “The rules are the same. Nothing different.”

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Trump has ramped up his criticism of the primary process after rival Ted CruzRafael (Ted) Edward CruzSenate confirms four Biden ambassadors after delay Overnight Health Care — Presented by Carequest — Colin Powell's death highlights risks for immunocompromised The Senate confirmation process is broken — Senate Democrats can fix it MORE swept Colorado’s 34 delegates, complicating Trump's push to secure the 1,237 needed delegates to lock up the nomination before the party's convention in July.

“It’s a rigged, disgusting dirty system,” Trump said at a rally Monday night in Albany, N.Y. “It’s a dirty system and only a nonpolitician would say it."

Trump's campaign has lashed out at the results from Colorado, which announced last August that it was scrapping its presidential preference poll. The state instead held a more complicated series of congressional caucus meetings leading up to a state convention over the weekend.

Colorado Sen. Cory GardnerCory GardnerColorado remap plan creates new competitive district Protecting the outdoors: Three cheers for America's best idea Ex-Sen. Cory Gardner joins lobbying firm MORE (R) also pushed back against Trump's criticism of the results, needling the businessman for not navigating the state's delegate selection process. The senator noted that Cruz showed up to attract support at the convention while Trump sent a surrogate.

"Elections are won by those who show up," Gardner said in a tweet Monday night.

--Jesse Byrnes contributed to this report, which was updated at 8:25 a.m.