A unanimous Supreme Court ruled Tuesday that the 30-day statutory deadline for moving a lawsuit from state court to federal court is not a suggestion. It is a hard cutoff, and missing it means the case stays put.
The decision landed in a high-profile dispute between Michigan and Enbridge, Inc. over the aging Line 5 pipeline that runs beneath the Straits of Mackinac. But the legal principle at its core reaches far beyond pipelines. It settles a question that has divided lower courts for years: whether the 30-day removal window in federal law can bend when a defendant has a good reason for being late.
The answer, the justices said, is no.
Michigan sued Enbridge in state court, seeking to shut down Line 5, a pipeline that carries oil and natural gas liquids beneath the Great Lakes. The state argued the pipeline poses an unacceptable environmental risk. Enbridge wanted the case heard in federal court, where it believed the legal terrain would be more favorable.
Federal law allows a defendant to "remove" certain cases from state to federal court, but the statute sets a firm timeline. Under 28 U.S.C. § 1446(b), a defendant must file a notice of removal within 30 days of receiving the initial pleading or summons. Enbridge missed that window. A panel of the U.S. Court of Appeals for the Sixth Circuit found the company filed too late, and the Supreme Court took the case to resolve whether the deadline carries the force of a jurisdictional bar or merely operates as a waivable procedural rule.
As SCOTUSblog reported, the Court held that the 30-day clock is mandatory. Justice Sonia Sotomayor wrote the opinion for all nine justices, concluding that Enbridge waited too long and forfeited its right to remove the case.
The opinion drew a clear line between two categories of legal time limits. Some deadlines are "jurisdictional," meaning a court must enforce them on its own, even if no party raises the issue. Others are "mandatory" but not jurisdictional, meaning they must be enforced if a party objects but can be forfeited if no one does. The 30-day removal deadline, Sotomayor wrote, falls into the second category.
The practical effect is the same for Enbridge: the case goes back to Michigan state court. Because Michigan raised the timeliness issue, the deadline had to be enforced. The Washington Times noted that the Sixth Circuit panel had already found Enbridge missed the 30-day window, and the Supreme Court let that outcome stand.
"Justice Sonia Sotomayor wrote for a unanimous court that the Enbridge energy company waited too long to try to move the case to federal court."
The distinction between "jurisdictional" and "mandatory" may sound academic, but it matters in practice. If the deadline were purely jurisdictional, federal courts would need to police it themselves in every case, dismissing removed actions even when both sides wanted to be in federal court. By labeling it mandatory instead, the Court preserved some flexibility while still giving the rule teeth whenever a party invokes it.
Removal disputes are a staple of federal litigation. Defendants in product liability suits, environmental cases, contract fights, and civil rights actions routinely try to move cases out of state court. The 30-day deadline governs all of them. Until now, some circuits treated a late filing as a fixable defect, while others treated it as fatal. The Supreme Court's decision eliminates that split.
For conservative legal observers, the ruling reinforces a principle that transcends any single policy outcome: procedural rules mean what they say. Courts should not stretch deadlines to rescue parties who failed to act on time, no matter how consequential the underlying dispute. That principle cuts across ideological lines. It disciplines plaintiffs and defendants alike.
The Court's recent willingness to rule unanimously on procedural questions signals that the justices can still find common ground when the text of a statute points clearly in one direction. Unanimous opinions carry extra weight with lower courts because they leave no room for litigants to exploit a fractured majority.
Sending the case back to state court does not decide whether Line 5 will keep operating. It decides only where the fight happens. Michigan will now press its claims before a state judge, while Enbridge will defend the pipeline's safety record and argue that federal energy policy supports continued operation.
The stakes are enormous. Line 5 carries roughly 540,000 barrels per day of light crude oil and natural gas liquids, supplying refineries in Michigan, Ohio, Pennsylvania, Ontario, and Quebec. Shutting it down would ripple through regional energy markets. Enbridge has proposed replacing the underwater segment with a tunnel beneath the lakebed, but that project has faced its own regulatory delays.
State court may prove a tougher venue for Enbridge. Michigan's attorney general has framed the pipeline as a ticking environmental bomb, and state judges may be more receptive to arguments grounded in state environmental law. Federal courts, by contrast, might have weighed federal pipeline safety regulations and interstate commerce considerations more heavily.
The Supreme Court's current docket reflects a broader pattern of the justices wading into disputes where federal and state authority collide. In another recent unanimous decision, the Court allowed oil companies to move Louisiana coastal damage suits into federal court, reaching the opposite result on removal but applying the same textual rigor to the procedural question at hand.
The ruling does not change the 30-day deadline itself. Congress set that timeline, and only Congress can alter it. Nor does it create any equitable exception for defendants who can show good cause for missing the window. If a defendant receives a complaint and fails to file a removal notice within 30 days, the opportunity is gone, period, as long as the opposing party objects.
The opinion also does not address whether the separate one-year outer limit on removal in diversity cases is likewise mandatory. That question, which has generated its own circuit split, remains open. Litigants and lower courts will likely press the justices to take it up in a future term.
Meanwhile, the Court continues to fill its docket with cases testing the boundaries of federal power. The justices recently agreed to hear a challenge involving state cancer warnings on pesticide labels, another dispute where state regulatory authority bumps up against federal preemption.
Defense lawyers across the country will feel this decision immediately. The 30-day clock now carries unmistakable consequences. Missing it by even a single day exposes a defendant to having its removal thrown out, with no safety valve. Law firms that handle high-volume litigation, where complaints can pile up and intake systems sometimes lag, face the highest risk.
The ruling also gives plaintiffs' lawyers a tactical tool. Filing in a favorable state court and then watching the clock becomes a viable strategy. If a defendant fumbles the deadline, the plaintiff can lock the case in state court permanently.
For institutional defendants like energy companies, insurers, and manufacturers, the message is simple: calendar the deadline the moment a complaint arrives, and treat it as sacred. The Supreme Court just confirmed that no amount of lawyering can undo a missed removal window.
The Court's broader term has featured several cases with direct implications for how legal rules apply to everyday Americans. The justices also agreed to hear a Second Amendment case testing whether habitual drug users can be barred from owning firearms, another dispute where the text of the law collides with practical enforcement questions.
The unanimous outcome is itself notable. The current Court is often described as fractured, with sharp ideological divisions on hot-button issues. But statutory interpretation cases, especially those involving procedural mechanics, tend to produce broader agreement. When the text is clear, the justices converge.
That dynamic played out here. The statute says 30 days. Enbridge filed after 30 days. The rest is arithmetic. No justice saw a reason to read flexibility into a deadline Congress wrote in plain terms.
Deadlines exist for a reason. They prevent gamesmanship, protect the expectations of opposing parties, and keep courts from becoming arbiters of excuses. When the highest court in the country says a deadline means what it says, that is not a technicality. It is the rule of law working exactly as designed.
