Republican presidential front-runner Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate 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 Carson Benjamin (Ben) Solomon CarsonState AGs condemn HUD rule allowing shelters to serve people on basis of biological sex Biden cannot keep letting Trump set the agenda The Hill's 12:30 Report: Trump heads to New Hampshire after renomination speech 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.