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Upon promulgation of the EPA's 2015 rule defining jurisdictional "Waters of the United States" (WOTUS) under the Clean Water Act, a coalition of states led by North Dakota sued the EPA in federal district court in North Dakota to challenge the rule. The states then moved for preliminary injunction against the rule, which the court granted within the territorial boundaries of the plaintiff states (North Dakota, Alaska, Arizona, Arkansas, Colorado, Idaho, Missouri, Montana, Nebraska, New Mexico, Nevada, South Dakota, and Wyoming). Soon thereafter, however, the U.S. Court of Appeals for the Sixth Circuit claimed authority to consider all challenges to the WOTUS rule—to the exclusion of the North Dakota district court and several other district courts in which lawsuits had been filed, including an NAM coalition lawsuit in the U.S. District Court for the Southern District of Texas. In January 2018, however, the U.S. Supreme Court ruled that the Sixth Circuit lacked jurisdiction to consider the various WOTUS challenges. This reactivated the North Dakota case, allowing the court to proceed to the states’ merits challenges to the 2015 rule. On June 8, 2018, the NAM filed an amicus brief on behalf of the states that explains how the rule was promulgated without required procedure and how the rule violates the Clean Water Act and the U.S. Constitution.