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

Republican presidential candidate Donald TrumpDonald John TrumpAssange meets U.S. congressman, vows to prove Russia did not leak him documents A history lesson on the Confederacy for President Trump GOP senator: Trump hasn't 'changed much' since campaign MORE is calling rival Ted CruzTed CruzThe media couldn't be more blatant in distorting Trump's words on Charlottesville Curtis wins GOP primary for House seat vacated by Jason Chaffetz Kimmel: Let’s make Trump a king so he has no power MORE "dirty" for starting a rumor about Ben CarsonBenjamin (Ben) Solomon CarsonBen Carson: ‘Be neighborly’ to fight racism OPINION | This country sorely needs leadership after Charlottesville OPINION | This is no time for moral midgetry in Charlottesville 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."