Donald Trump told supporters in Iowa that Ben Carson has admitted having "pathological" issues, bringing up child molesters in an attack on his Republican rival. 

In a 95-minute, teleprompter-less tirade, Trump wondered if those who support Carson are "stupid" for believing the retired neurosurgeon's life story. 

"How stupid are the people of Iowa? How stupid are the people of this country to believe this crap?" he asked, launching into a diatribe about Carson's past.

"I'm not saying it. He actually said 'pathological temper,' and then he defined it as disease. ... If you're pathological, there's no cure for that, folks. If you're a child molester, a sick puppy, there's no cure for that. There's only one cure. We don't wanna talk about that cure," he said. 

The only opponent who was spared criticism by Trump was Sen. Ted Cruz. 

Bill Hemmer discussed the comments with digital politics editor Chris Stirewalt, who suggested that Trump may want to start using a teleprompter after this set of remarks. 

Stirewalt said the comments stem from Trump falling behind or being tied with Carson in recent polls.

"He's lashing out at his rival. He's lashing out at voters. This is an unhappy place that he's occupying and it's getting very ugly out there," said Stirewalt.

Stirewalt said that calling voters "stupid" for supporting another candidate is not going to work out for Trump.

He then noted that Trump's 25% support has been "static" since July,predicting that Trump will be defeated when those who do not support him eventually "band together" behind one candidate.

Watch the "America's Newsroom" segment above. 

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