https://www.washingtonpost.com/news/energy-environment/wp/2017/03/29/trump-epa-declines-to-ban-pesticide-that-obama-had-proposed-outlawing/
The EPA banned its spraying indoors to combat household bugs more than a decade ago. But only in recent years did the agency seek to ban its use in agriculture, after mounting scientific evidence that prenatal exposure can pose risks to fetal brain and nervous system development.
“This frees American farmers from significant trade disruptions that could have been caused by an unnecessary, unilateral revocation of chlorpyrifos tolerances in the United States.”(Sod the unborn - we wanna sell abroad!)
“The chance to prevent brain damage in children was a low bar for most of Scott Pruitt’s predecessors, but it apparently just wasn’t persuasive enough for an administrator who isn’t sure if banning lead from gasoline was a good idea,” Environmental Working Group president Ken Cook said in a statement. “Instead, in one of his first major decisions as head of the EPA, like a toddler running toward his parents, Pruitt leaped into the warm and waiting arms of the pesticide industry.”
see
https://en.wikipedia.org/wiki/Chlorpyrifos 
