Secret Audio Sparks Trump vs. Cruz Twitter Rants

GOP front-runner Donald Trump on Friday night followed up a Twitter assault on rival Ted Cruz with a barrage of insults at a campaign event in Iowa, appearing to signal an end to his friendly relationship with the Senator from Texas.

But on Saturday morning, the billionaire New York real estate developer tried to downplay the unpleasantness, saying he was "having a little fun with Ted" at the rally.

"We have had a very good relationship," Trump told Fox News' "Fox and Friends Weekend" on Saturday. "I'm sure it will end because, you know, he has got to come after me at some point. I'm leading by a lot as you know, so at some point he i