Donald Trump Goes on Anti-Cruz Tirade With 'Dirty' Campaign Charge

The business mogul goes after Texas Sen. Ted Cruz after Iowa loss Monday night.

Trump is doing more than just going after Cruz on Twitter; he's doing it in his campaign speeches and at his news conferences. When ABC News asked Trump at a news conference Tuesday night whether Cruz is running a dirty campaign, he said, "I think he was certainly dirty. What he did to Ben Carson was terrible. I think what he did to voter violation forum; I thought that was terrible."