Chlorpyrifos has been linked to developmental delays in kids and other health problems. The EPA is fighting a lower court's ruling that it must ban the pesticide, which farmers say they need.
New EPA administrator Scott Pruitt has decided not to ban chlorpyrifos, a pesticide widely used on produce.
The safety of chlorpyrifos has been in question for almost three decades. The next step is an outright ban by the EPA, though it's unclear if that will happen.