Scott Pruitt’s EPA and the White House sought to block publication of a federal health study on a nationwide water-contamination crisis, after one Trump administration aide warned it would cause a “public relations nightmare,” newly disclosed emails reveal.

The intervention early this year — not previously disclosed — came as HHS’ Agency for Toxic Substances and Disease Registry was preparing to publish its assessment of a class of toxic chemicals that has contaminated water supplies near military bases, chemical plants and other sites from New York to Michigan to West Virginia. Read more.