The Trump administration feared it would be a “public relations nightmare”: a major federal study that concluded contaminated groundwater across the country, especially near military bases, was more toxic than the government realized. Political aides to President Donald Trump and Environmental Protection Agency head Scott Pruitt pressured the Agency for Toxic Substances and Disease Registry against releasing the results.

“The public, media, and Congressional reaction to these numbers is going to be huge,” an unidentified White House aide wrote, according to Politico . “The impact to EPA and [the Defense Department] is going to be extremely painful.We cannot seem to get ATSDR to realize the potential public relations nightmare this is going to be.” The study was not released.