Story highlights Donald Trump retweeted a tweet that insulted Iowans

A new poll out Thursday showed Trump behind Ben Carson in the state's Iowa caucuses

Des Moines, Iowa (CNN) Donald Trump on Thursday retweeted an insult to Iowa voters, just hours after a poll showed him behind retired neurosurgeon Ben Carson in the state.

"'@mygreenhippo #BenCarson is now leading in the #polls in #Iowa. Too much #Monsanto in the #corn creates issues in the brain? #Trump #GOP,'" Trump's retweet states.

Monsanto is a Missouri-based agricultural corporation that produces herbicides, among other agrochemicals.

"Is Trump going after Iowans now?" Des Moines Register chief politics reporter Jennifer Jacobs wrote on Twitter, linking to the tweet

A few hours after the initial retweet, Trump removed it from his feed and tweeted , "the young intern who accidentally did a Retweet apologizes."

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