"The U.S. Environmental Protection Agency is reportedly issuing a proposed rule to undo the Clean Water Rule that was enacted in May 2015, under President Obama's last term. The rule protects the water supply for more than 117 million Americans. Also known as the Waters of the United States (WOTUS), the Clean Water Rule puts limits on pollution in the wetlands, rivers and streams that feed the nation's larger waterways. Those limits are essential for protecting the safety of the drinking water on which millions of American rely. The rule also safeguards those waters for swimming, fishing and other activities. In addition, the rule helps to maintain the biological integrity of those smaller waterways, in turn protecting wildlife by keeping aquatic ecosystems healthy. When the rule was issued, the EPA and the Army Corps of Engineers resolved decades of legal debate among politicians, environmentalists and public health advocates, saying that smaller waterways across the nations -- tens of millions of acres of wetlands and thousands of streams -- actually qualify for legal protection under the Clean Water Act, the primary federal law that protects communities and ecosystems from water pollution. Since then, Senate Republicans have made several failed attempts to overturn the rule, arguing that the rule gives undue authority to the federal agencies."