Before becoming secretary of the US Department of Health and Human Services and leader of the Make America Healthy Again movement, Robert F. Kennedy Jr. was a swashbuckling environmental attorney who regularly took aim at the meat industry. He sued large meat companies and the Environmental Protection Agency over water pollution from factory farms, and criticized factory farming for its “unspeakable” animal cruelty and overreliance on feeding animals hormones and drugs.

For over a decade, a group of food safety, environmental, and animal welfare nonprofits has petitioned the US Food and Drug Administration — which Kennedy now oversees — to ban the use of one of the most controversial of those drugs: ractopamine hydrochloride.

Fed to pigs in the final weeks of their lives, ractopamine speeds up muscle gain so that pork producers can squeeze more profit from each animal. But the drug has been linked to severe adverse events in pigs, including trembling, reluctance to move, collapse, inability to stand up, hoof disorders, difficulty breathing, and even death. It also carries a number of environmental and human health concerns.