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

Republican presidential candidate Donald TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti MORE is calling rival Ted CruzRafael (Ted) Edward CruzWith religious liberty memo, Trump made America free to be faithful again Interstate compacts aren't the right way to fix occupational licensing laws Texas Dem: ‘I don’t know what to believe’ about what Trump wants for wall MORE "dirty" for starting a rumor about Ben CarsonBenjamin (Ben) Solomon CarsonTrump must pair more respectful rhetoric with positive policies Trump honors MLK amid firestorm over racially charged remarks Reporter asks Trump 'Are you a racist?' after MLK event 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."