By Carey Gillam

Newly released government email communications show a persistent effort by multiple officials within the U.S. Environmental Protection Agency (EPA) to slow a separate federal agency's safety review of Monsanto's top-selling herbicide. Notably, the records demonstrate that the EPA efforts came at the behest of Monsanto, and that EPA officials were helpful enough to keep the chemical giant updated on their progress.

The communications, most of which were obtained through Freedom of Information Act (FOIA) requests, show that it was early 2015 when the EPA and Monsanto began working in concert to stall a toxicology review that a unit of the Centers for Disease Control and Prevention (CDC) was conducting on glyphosate, the key ingredient in Monsanto's branded Roundup herbicide products. The details revealed in the documents come as Monsanto is defending itself against allegations that it has tried to cover up evidence of harm with its herbicides.