Summary:
U.S. Supreme Court rules unanimously for Michigan AG Dana Nessel
Enbridge missed 30-day deadline to remove Line 5 case to federal court
Justice Sotomayor emphasizes early resolution of removal questions
A unanimous U.S. Supreme Court ruled for Michigan Attorney General Dana Nessel in her argument that Enbridge Energy waited too long to ask to move a lawsuit about twin pipelines running beneath the Straits of Mackinac to federal court from state court.
The decision, announced on April 22 and less than two months after the court heard oral arguments in Washington, may revive a 7-year-old case Nessel brought in Ingham County to effectively block Enbridge from using Line 5, a 645-mile-long oil and natural gas pipeline system that runs from Wisconsin through Michigan and into Canada.
It doesn't immediately settle any of the specific legal issues regarding the use of the pipelines, however.
In that case, Nessel, who campaigned in 2018 in favor of shutting down the line at the bottom of the Straits of Mackinac, argued that Enbridge's operation of Line 5 violated state law and declared the 1953 easement granted to the state void, citing the risk of an oil spill and the consequences it could have. Enbridge has argued for decades that the line is safe and protected by an international treaty and has moved to build a new single pipeline that would be encased in a 21-foot-diameter tunnel at the bottom of the Straits.
Before any action occurred in Nessel's 2019 case, Gov. Gretchen Whitmer, in late 2020, issued an order to revoke the 1953 easement granted for the oil and natural gas pipeline as well and filed a lawsuit herself in state court. Enbridge then successfully had Whitmer's case moved to U.S. District Court under federal statute, noting the treaty with Canada involving Line 5 and other issues it said were better suited to be heard in a federal court.
Whitmer dropped that case in late 2021, though Enbridge countersued Whitmer in an attempt to block her revocation of the 1953 easement, winning a summary judgment in that effort in a federal court in Michigan in late 2025. (Whitmer has asked the 6th U.S. Circuit Court of Appeals in Cincinnati to reconsider that decision.) But it was only after Enbridge successfully got that earlier case by Whitmer moved to federal court that the company tried to move Nessel's case to federal court, citing the same reasons. The only problem is that it tried to do so more than two years after it was filed, missing a 30-day deadline.
Enbridge argued that a legal concept known as "equitable tolling" applied, allowing for such a delay, effectively equating it to a statute of limitations which had been held in abeyance while the other transfer was decided and noting the international issues involved.
"It’s not suffering for a state to have to litigate in federal court," John Bursch, a Grand Rapids lawyer and former Michigan solicitor general who represented Enbridge, said before the Supreme Court during arguments in February. He added that, as far as Enbridge was concerned, Congress didn't intend to "handcuff federal courts" when it came to deciding the best forum for such issues to be considered.
But state officials had reason to argue the issue belonged in state court as well. A Michigan judge, for one, might be "better attuned to the state’s interests in environmental protection, recreation and the state’s economy," the American Bar Association said in a preview of the case.
Nessel's office argued before the court in February that there was no valid reason for Enbridge to be allowed to blow past the 30-day delay, especially considering the federal statute allowing for removal to federal court didn't specifically grant one. To provide one in this case could open the door to delays for almost any reason, the state said.
Arguing before the court in February, Ann Sherman, Nessel's solicitor general, said Congress never intended to give parties so much leeway in transferring cases. "This is not an area where Congress said federal courts have exclusive jurisdiction," she said. "We trust the state court to do it."
A unanimous Supreme Court agreed, though it stopped short of deciding whether there were no reasons for delay under the removal statute other than those specifically enacted by Congress.
Writing for the court, Justice Sonia Sotomayor said, "Enbridge cannot identify any sensible reason why Congress would have adopted so many express, specific equitable exceptions to (removing a civil case from state court to federal court) if equitable tolling was already available for belated removals across the board."
"Allowing equitable tolling of (the statute's) deadline would undermine Congress’s manifest interest in resolving threshold removal questions early and conclusively," Sotomayor wrote. "Under the rule the court adopts today, plaintiffs that sue in state court usually can be confident that, after (the) deadline has elapsed, the forum question has been put to rest and the case will proceed in the chosen court. Under the rule Enbridge favors, to the contrary, the possibility of a late removal would hang over a case, generating uncertainty and risking significant waste of resources in one forum before a possible belated removal to another."
Nessel didn't immediately react to the decision but it was cheered by officials with the Oil & Water Don't Mix Campaign, a coalition of several environmental groups working to close down Line 5 through the Straits.
“This is a clear and pivotal win generated by the movement to shut down Line 5," said Sean McBrearty, the campaign's coordinator. “Now, this case will head back to state court, where it belongs. Thanks to Michigan’s attorney general, we are closer than ever to taking down a foreign fossil fuel giant that is putting 84 percent of North America’s available, fresh surface water at risk each day that Line 5 continues operating."
Ryan Duffy, a spokesman for Enbridge, said, the decision aside, Line 5 remains regulated by the federal government, which conducts annual inspections and has identified "no safety issues that would warrant its shutdown."
As to the Supreme Court's decision, he said a federal court "already concluded that the governor's efforts to shut down Line 5 were preempted" and that Nessel's state court case "has been stayed by stipulation of the parties pending the outcome of the governor’s appeal" of last year's federal court ruling. "Enbridge is committed to the safe operation of Line 5 and to working constructively with regulators and stakeholders," he added.
Some other groups were displeased as well, with the National Federation of Independent Businesses (NFIB), an association of small businesses, saying it puts in place a rigid time limit for removal to a federal court that wasn't there before.
“Congress never intended for plaintiffs to use procedural gamesmanship and lawsuit manipulation to avoid federal jurisdiction,” said Beth Milito, vice president and executive director of NFIB’s Small Business Legal Center. “At first glance, this case may seem like inconsequential bureaucracy to the average American, but the court’s decision will have a very real impact on small business owners whose cases are appropriate for federal court.”
This story was updated with additional information.
Contact Todd Spangler: [email protected]. Follow him on X @tsspangler.