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

Republican presidential candidate Donald TrumpDonald John TrumpSecret Service members who helped organize Pence Arizona trip test positive for COVID-19: report Trump administration planning pandemic office at the State Department: report Iran releases photo of damaged nuclear fuel production site: report MORE is calling rival Ted CruzRafael (Ted) Edward CruzTrump administration grants funding extension for Texas testing sites Hillicon Valley: Democrats introduce bill banning federal government use of facial recognition tech | House lawmakers roll out legislation to establish national cyber director | Top federal IT official to step down GOP lawmakers join social media app billed as alternative to Big Tech MORE "dirty" for starting a rumor about Ben CarsonBenjamin (Ben) Solomon CarsonCarson calls for local leaders to 'condemn vandalization of statues,' 'dismantle autonomous zones' Ben Carson to read stories for children at home amid the coronavirus pandemic Melania Trump reads 'All Different Now' by Angela Johnson to mark Juneteenth 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."