Trump: What Cruz did to Carson in Iowa was 'dirty'

Republican presidential candidate Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE is calling rival Ted CruzRafael (Ted) Edward CruzWhatever you think the Alabama special election means, you’re probably wrong This week: Congress gets ball rolling on tax reform Week ahead: Senators work toward deal to fix ObamaCare markets MORE "dirty" for starting a rumor about Ben CarsonBenjamin (Ben) Solomon CarsonPrice resignation sets off frenzy of speculation over replacement We are all to blame for the Las Vegas shooting India's IBM conquest is an ominous sign for American industry MORE's campaign ending after the Iowa caucuses.

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"[Ted Cruz] insulted Ben Carson," the billionaire said at a news conference before a campaign rally in Milford, N.H. "What he did to Ben Carson was a disgrace." 

Trump also accused Cruz of insulting the people of Iowa when he sent out a voter violation mailer before the caucuses. 

When asked if he thought Cruz was running a dirty campaign, Trump responded that his rival "certainly was dirty." 

"What he did to Ben Carson was terrible," Trump said. "When they said Ben Carson is out of the race and come vote for him, I thought it was terrible." 

Cruz apologized to Carson earlier Tuesday for the "mistake."