The Environmental Protection Agency is set to undo yet another Obama-era environmental regulation after releasing a proposal on Tuesday meant to dismantle a rule protecting rivers and streams from pollution.

The latest target from the notably anti-environmental administration of President Donald Trump is the Clean Water Rule, which in 2015 updated a longstanding act passed during the advent of the EPA to clean up heavily polluted federal waterways. The rule, passed under former President Barack Obama , expanded federal authority to include all navigable waters under the jurisdiction of the Clean Water Act. The rule ultimately would have protected the drinking water of more than 117 million Americans , according to the EPA, but it has been stayed by a federal court since 2015.