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

Republican presidential candidate Donald TrumpDonald John TrumpIG investigating Comey memos over classified information: report Overnight Defense: Congress poised for busy week on nominations, defense bill | Trump to deliver Naval Academy commencement speech | Trump administration appeals decision to block suspected combatant's transfer Top Pruitt aid requested backdate to resignation letter: report MORE is calling rival Ted CruzRafael (Ted) Edward CruzCruz's Dem challenger slams Time piece praising Trump Race for Republican Speaker rare chance to unify party for election 32 male senators back Senate women's calls to change harassment rules MORE "dirty" for starting a rumor about Ben CarsonBenjamin (Ben) Solomon CarsonOvernight Tech: AT&T chief takes the stand to defend merger | Facebook keeps most users out of EU data law's reach | HUD reopens probe into Facebook housing ads | Venture capital firms go to bat for cryptocurrencies Overnight Finance: IMF chief warns against US-China trade war | Trump, Abe can't strike deal on tariff exemptions | Republicans push Trump to rescind Gateway funds Facebook investigated over alleged housing discrimination 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."