Republican presidential front-runner Donald Trump says his biggest rival, Texas Sen. Ted Cruz, is "nervous" with less than a week to go before Iowa's lead-off caucuses.
Speaking to MSNBC and FOX News early Tuesday, Trump lashed out at his opponent, calling him "a big mess" and claiming "people have realized he probably can't even run for president."
The two Republicans are locked in a tight race in first-to-vote Iowa, but Trump is the national front-runner.
Trump also said the recent endorsement he received from conservative firebrand Sarah Palin "threw an ax into the machinery for Cruz because, man, he expected that endorsement 100 percent."
Cruz has said that he will continue to be a big fan of Palin's, regardless who she backs in the campaign.