Trump fired off several tweets, claiming that "over one million people have been precluded from voting" and that party rules were designed to hurt his campaign.

Asked in an interview aired Thursday morning on "Fox and Friends" if he thought the state intentionally announced the change after he declared his bid, Trump responded, "I think so, yeah, I think so, because they saw that I do very well in Colorado, so I think so."

Party officials have been pushing back for days against Trump's claims, noting that rival Ted CruzTed CruzClinton to sit down with Colbert on eve of NY primaryProsecutor formally declines to file charges against Trump aideCruz backs North Carolina's transgender bathroom lawMORE simply took advantage of the delegate selection process after the state announced last August that it was scrapping its preference poll for local caucus-type meetings leading up to a state convention.