Trump blaming fall in Iowa poll on GMO corn?
© Greg Nash

Republican presidential front-runner Donald TrumpDonald John TrumpDavid Axelrod after Ginsburg cancer treatment: Supreme Court vacancy could 'tear this country apart' EU says it will 'respond in kind' if US slaps tariffs on France Ginsburg again leaves Supreme Court with an uncertain future MORE on Thursday reposted a tweet from a follower blaming his fall in a new Iowa poll on genetically modified corn that “creates issues in the brain.”

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A poll released by Quinnipiac University early Thursday shows Trump trailing retired neurosurgeon Ben CarsonBenjamin (Ben) Solomon CarsonCarson's affordable housing idea drawing undue flak Overnight Energy: Trump EPA looks to change air pollution permit process | GOP senators propose easing Obama water rule | Green group sues EPA over lead dust rules Green group sues EPA over lead dust rules it says are too lax MORE by 8 points among likely caucus-goers.

The tweet references Monsanto, a company that pioneered the use of genetically modified organisms (GMO) in farming. GMO farming produces larger crops and saves resources, but critics say food that has been genetically engineered is not safe for consumption.

The St. Louis-based company has become the poster child for opponents of GMOs, spurring a “March Against Monsanto” movement.

Concerned groups have launched unsuccessful state ballot initiatives that would require foods that contain GMOs to be labeled.

The Food and Drug Administration, however, has said food made with GMOs is safe.