https://thinkprogress.org/waters-of-the-united-states-rule-scalia-trump-rewrite-7327a1343836
"On Tuesday, February 28, surrounded by Republican lawmakers, President Donald Trump signed an executive order instructing the Environmental Protection Agency and the Army Corps of Engineers to begin the process of rolling back the Obama administration’s Clean Water Rule. That rule was finalized in 2015, so Trump couldn’t unilaterally undo it with the stroke of a pen. Instead, he asked the appropriate agencies to rewrite the rule and redefine “navigable waters” — a term that has plagued courts for decades — according to the definition put forth by the late Supreme Court Justice Antonin Scalia in 2006. And while that might seem like a small change, legal experts say that directive could vastly reduce the federal government’s ability to protect the nation’s streams, rivers, and wetlands from pollution."
