President Donald Trump's decision to expand domestic production of glyphosate, the world's most widely used herbicide, has triggered an unexpected political backlash from a segment of voters that helped fuel his 2024 election victory: the Make America Healthy Again movement championed by Health and Human Services Secretary Robert F. Kennedy Jr.
The controversy erupted after Trump signed an executive order in February invoking the Defense Production Act to support domestic manufacturing of glyphosate, a chemical widely used in agriculture and best known as the active ingredient in Roundup. The White House described the move as essential to food security, agricultural productivity and reducing dependence on foreign supply chains.
Instead of rallying support among Kennedy's health-conscious political allies, the order has exposed growing tensions within the coalition that united around Trump's pledge to tackle chronic disease and environmental health concerns.
Much of the anger centers on Kennedy's own history. Before joining the Trump administration, Kennedy repeatedly criticized glyphosate and represented plaintiffs in litigation against Monsanto, the former maker of Roundup. During his 2024 presidential campaign, Kennedy wrote on social media that "glyphosate is one of the likely culprits in America's chronic disease epidemic" and pledged to restrict its use in agriculture.
He later reinforced those concerns during a podcast appearance in early 2026, stating, "I believe glyphosate causes cancer."
The administration's position now appears markedly different. In a statement issued through the Department of Health and Human Services after Trump's executive order, Kennedy defended the policy.
"Donald Trump's executive order puts America first where it matters most, our defence readiness and our food supply," Kennedy said. "Unfortunately, our agricultural system depends heavily on pesticides and herbicides... If these inputs disappeared overnight, crop yields would fall, food prices would surge, and America would experience a massive loss of farms."
The reversal has become a flashpoint for activists who viewed Kennedy as the movement's most prominent advocate. Several leading figures within the MAHA movement publicly condemned the decision.
Environmental Working Group President Ken Cook accused the administration of betraying supporters who expected stronger restrictions on chemical exposure.
"By granting immunity to the makers of the nation's most widely used pesticide, President Trump just gave Bayer a license to poison people. Full stop," Cook said.
Cook also criticized what he described as the political treatment of Kennedy's supporters, arguing they had been "treated by MAGA like a convenient group of useful idiots ever since Kennedy joined Trump on the campaign trail."
The dispute extends beyond environmental concerns. Critics have focused heavily on provisions that they argue shield glyphosate manufacturers from certain state-level legal challenges. That issue carries particular symbolism because one of the most significant legal victories against Monsanto involved a lawsuit Kennedy helped support years before joining the administration.
Prominent MAHA activists including Vani Hari, known as the "Food Babe," and Moms Across America founder Zen Honeycutt have publicly opposed the order. Hari described the move as "a direct assault on MAHA" and "a gift to pesticide and chemical industry lobbies at the expense of human health."
The administration's own past findings have further complicated the debate. The MAHA Commission's 2025 report noted that "a selection of research studies... have noted a range of possible health effects, ranging from reproductive and developmental disorders as well as cancers, liver inflammation and metabolic disturbances."
At the same time, regulatory agencies remain divided. The World Health Organization classified glyphosate as "probably carcinogenic" in 2015, while the U.S. Environmental Protection Agency has not concluded that glyphosate causes cancer when used according to approved guidelines.
The political fallout is now drawing increasing attention inside Republican circles ahead of the 2026 midterm elections. According to reports, a coalition of more than 240 MAHA activists warned the White House that the policy could damage support among health-focused voters who crossed party lines to back Trump and Kennedy.
Their letter reportedly argued that Republicans "risk[s] losing both moral ground and political support" and warned that expanding legal protections for pesticide manufacturers "may well cost you the House majority in the midterms."
White House spokesman Kush Desai rejected suggestions that the administration had abandoned its health agenda.
"Delivering on the MAHA agenda has been a presidential priority since Day One, and no administration has done more to address America's multi-faceted chronic disease epidemic than the Trump Administration," Desai said.
