Can You Take a State Loss to Federal Court?
Businesses that lose in state court sometimes try to challenge that result in federal court instead, asking a federal judge to declare the state ruling unconstitutional or unenforceable. Federal trial courts cannot provide that relief. In its June 18, 2026 decision in T. M. v. University of Maryland Medical System Corp., the Supreme Court reaffirmed that a party who lost in state court cannot use a federal district court to set aside that judgment, which applies even while the state appeal is still pending.
What Stops a Federal Trial Court from Reviewing a State Court Ruling?
The barrier is a rule called the Rooker-Feldman doctrine, and it rests on how the court system is built. Federal trial courts have original jurisdiction: they hear cases in the first instance. They do not sit as appeals courts over state courts. By statute, only the U.S. Supreme Court can review a state court judgment, and only after the state’s highest court has finished with it. A party who lost in state court therefore cannot use a federal district court as a backdoor appeal. When the real goal of the federal suit is to have the state ruling reviewed and rejected, the federal court has no power to hear it.
How Did the Supreme Court Resolve the Split?
The open question was timing. Several federal circuits had read the doctrine to kick in only once the state proceedings were completely over, which meant that the doctrine would not yet apply if you filed the federal suit while the state appeal was still live. This case put that theory to the test. After a medical dispute, a patient negotiated a settlement that a Maryland judge entered as a consent order and secured her release. Ten days later, she sued in federal court and argued it was signed under duress, while at the same time appealing that order in state court. The federal district court dismissed for lack of jurisdiction, and the Supreme Court affirmed. The pending state appeal made no difference because she was asking the federal court to throw out a state court ruling, which is exactly what the doctrine forbids.
What Does This Mean for You?
If you receive an adverse ruling in state court, the route to challenge it runs through the state appellate process, with the U.S. Supreme Court as the final stop. A parallel federal lawsuit aimed at voiding that ruling will be dismissed, and filing it early provides nothing but wasted fees. What truly matters is how your claim is characterized. Asking a federal court to overturn a state judgment is off the table, but bringing a separate, forward-looking federal claim is appropriate. Before filing a second lawsuit in federal court, be sure of which one you are actually pursuing.