Meanwhile, the EPA has announced new plans to roll back an Obama administration policy that environmentalists say will remove drinking water safeguards for one in three Americans and threaten wetlands and thousands of streams that flow into larger rivers and lakes. The 2015 regulation determined more than half of the country’s waterways are covered under the Clean Water Act. In a statement Tuesday, EPA chief Scott Pruitt announced plans to rescind the rule and launch a review of which water bodies will fall under federal protection.