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

Republican presidential candidate Donald TrumpDonald TrumpShould government 'outsource' censorship to Facebook and Twitter? Sanders: FBI's investigation of wife won’t be a ‘distraction’ Schiff: Obama's delayed response to Russian interference 'a very serious mistake' MORE is calling rival Ted CruzTed CruzSenate Republicans reluctant to rush vote on healthcare bill Healthcare bill 'not the last step' to repealing ObamaCare, Republican says Dem senator: GOP's healthcare approach will 'devastate Medicaid' MORE "dirty" for starting a rumor about Ben Carson'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."