The U.S. Army Corps of Engineers' 2015 Clean Water Rule sought to clarify the jurisdictional limits of the Clean Water Act. But, the complex rule has triggered much confusion, controversy and litigation. The Trump administration now seeks to repeal and replace the Obama-era Clean Water Rule. In January 2018, the U.S. Supreme Court further complicated the issue by overturning the national stay and sending the case back to the federal district courts.