Trump admin re-ups support for Roundup weedkiller

By Ellie Borst | 03/03/2026 01:53 PM EST

“This is a MAHA loss,” one activist said of the Supreme Court brief arguing that cancer labels on the pesticide would violate federal law.

A man holds up a container of Roundup in a pesticide aisle at a store.

Customer Gary Harms shops for Roundup products at a store in San Rafael, California, on July 9, 2018. Josh Edelson/AFP via Getty Images

Adding a cancer warning label to the popular weedkiller Roundup would violate federal law, EPA and Justice Department attorneys said in a Supreme Court brief.

It’s the latest — but far from the first — instance of the Trump administration stepping in to defend use of the contentious herbicide and the latest development in a saga that has captured widespread attention, thanks in part to Health Secretary Robert F. Kennedy Jr. and his base of “Make America Healthy Again” supporters.

The Trump administration filed another amicus brief Monday siding with pesticide giant Bayer in its fight to get the Supreme Court to overturn a lower court’s decision linking Roundup’s main ingredient, glyphosate, to non-Hodgkin lymphoma.

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The brief reiterates arguments Solicitor General D. John Sauer made in December that federal pesticides law preempts state laws on labeling requirements. This time the push came with support from EPA General Counsel Sean Donahue and other career agency attorneys.

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