One Judge, One Injunction, One Country, and How Federal Courts Block Policy

Imagine you run a lumberyard in Ohio. On a Monday morning, the federal government announces a rule that changes how you must label, store and report your inventory. By Wednesday, a federal judge in a city you have never visited, in a case you were never part of, issues an order that freezes the rule for the whole country. By Friday, a court in another state says the opposite. Your lawyer asks you a simple question: are you supposed to follow the rule or not? And you, a person who just wants to sell lumber, discover that the answer depends on a doctrine most Americans never learned in school.

Welcome to the world of the injunction. It is one of the most powerful tools in the federal courts, one of the least understood, and one that both parties have loved or hated depending on whether their own President was on the receiving end. I'm going to walk through how it works, from the first emergency order to the Supreme Court, because you cannot judge the argument over "rogue judges" without knowing what a judge is actually allowed to do. And I'm going to be even-handed about it, because the record on this one is bipartisan.

What an injunction is

An injunction is a court order telling someone to do something or stop doing something. It comes from a branch of law called equity, which historically grew up in the English Court of Chancery to give remedies when money damages weren't enough. A court can award you money after the fact; an injunction tries to prevent the harm before it happens. It is the difference between a judgment that pays you for a flooded basement and an order that stops the neighbor from opening the dam.

Because it is such a strong remedy, the law puts a series of hurdles in front of it. Equity is also tied to history, which will matter in a moment.

Step one: the temporary restraining order

The fastest tool is the temporary restraining order, or TRO. Under Rule 65(b) of the Federal Rules of Civil Procedure, a court can issue a TRO, sometimes without even notifying the other side, if the person asking shows that immediate and irreparable injury will result before the other side can be heard. The key limit is time. A TRO issued without notice expires within 14 days unless the judge extends it for good cause for another like period, or the other side consents to more. The math is simple: 14 days plus a 14-day extension is 28 days. Then the court must either turn the order into something more lasting after a hearing, or let it lapse.

A TRO is a stopgap to hold the status quo while the court gets its bearings. It is also the order that most often makes the news, because it can arrive in a day.

Step two: the preliminary injunction and the four Winter factors

The next step is the preliminary injunction, which lasts while the case moves forward, often for months or years. It requires notice and a hearing under Rule 65(a). The Supreme Court laid out the test in Winter v. Natural Resources Defense Council (2008), a case about whether the Navy's sonar training exercises off the Southern California coast could be stopped to protect marine mammals. The Court said the person asking has to show four things:

1. A likelihood of success on the merits. That is, they are probably going to win the case.
2. A likelihood of irreparable harm without the injunction. Not a mere possibility, a likelihood, and the harm must be the kind that money can't fix.
3. That the balance of equities tips in their favor. The harm to them without the order outweighs the harm to the other side with it.
4. That an injunction is in the public interest.

Chief Justice John Roberts wrote that a preliminary injunction is an "extraordinary remedy never awarded as of right." In Winter the Court sided with the Navy, because the national security interest outweighed the plaintiffs' interest. When the defendant is the federal government, factors three and four tend to merge: the harm to the government and the public interest are often the same thing. That is why government lawyers argue that any order blocking a policy harms the public, and why the plaintiffs argue the opposite.

Rule 65(c) adds a wrinkle: the court may require the person who gets the injunction to post security, a bond, to cover costs if the order turns out to be wrong. In suits against the government, judges often set it low.

After a trial or a decision on the law, the court can issue a permanent injunction, which is the final remedy, subject to a similar four-part test the Supreme Court set out in a 2006 patent case, eBay v. MercExchange.

Step three: how far the order reaches

Here is where the heat comes from. A court normally decides a case between the parties in front of it. If you sue and win, the court tells the defendant to stop harming you. Article III of the Constitution gives federal courts the power to decide "Cases" and "Controversies," and the Court has said standing must be shown by each plaintiff for the relief he seeks. So how does one judge's order end up covering the whole country?

The answer is the universal injunction, also called the "nationwide injunction": an order that bars the government from enforcing a policy against everyone, not just the people who sued. The legal scholar Samuel Bray, in a 2017 Harvard Law Review article titled "Multiple Chancellors: Reforming the National Injunction," made the case that such orders were historically unusual, that they clash with the way equity traditionally worked, and that they invite forum shopping. By "multiple chancellors," he meant that the country has hundreds of district judges, each acting like a chancellor with national power, and any plaintiff can choose the one he likes. If one judge says yes and another says no, the plaintiffs can keep trying until someone says yes, while the government must win every time.

Bray's historical argument tracks a Supreme Court decision from 1999, Grupo Mexicano de Desarrollo, S.A. v. Alliance Bond Fund, Inc., in which the Court said that the equitable authority of federal courts is limited to the relief traditionally accorded by courts of equity at the time of the Judiciary Act of 1789. That is the "equity as of 1789" test, and it is an originalist idea applied to remedies. If a form of relief was not available in 1789, the argument goes, a federal court has to ask whether Congress has authorized it.

The bipartisan record

If you think this fight belongs to one party, look at the examples.

Under President Obama: In February 2015, Judge Andrew Hanen, a federal district judge in Brownsville, Texas, blocked nationwide the administration's Deferred Action for Parents of Americans (DAPA) program in a suit brought by Texas and other states. The Fifth Circuit left the injunction in place, and in June 2016 the Supreme Court split 4 to 4, which left the lower court's ruling standing without a precedent. Many conservatives welcomed the fact that a single judge could stop what they saw as executive overreach.

Under President Trump, first term: After he issued orders restricting travel from several countries, district courts in Hawaii and Maryland, among others, blocked the policies for the whole country. In Trump v. Hawaii (2018) the Supreme Court upheld the final version of the travel proclamation, 5 to 4. In a concurrence, Justice Clarence Thomas wrote that nationwide injunctions appear to be legally and historically dubious. Many conservatives who had welcomed the Texas order now complained about the Hawaii order, and many liberals who had welcomed the Hawaii order had complained about Texas.

Later: In June 2025, in Trump v. CASA, the Supreme Court held that universal injunctions likely exceed the equitable authority Congress has given to federal courts, in an opinion by Justice Amy Coney Barrett. The ruling left open other avenues: class actions, relief for states as plaintiffs and challenges under the Administrative Procedure Act. In other words, the question of whether a judge can protect the whole country did not vanish; it changed vehicles.

I'm going to say something that may annoy people on both sides of the aisle. If you think "rogue judges" are a scandal when your side loses, but a triumph of the rule of law when your side wins, then you do not have a principle, you have a rooting interest. The principled position is one you would accept with the other party in the White House.

Other ways a policy gets blocked for everyone

Even without universal injunctions, there are three routes to nationwide effect.

Class actions. Under Rule 23, a plaintiff can ask the court to certify a class, a defined group of people with similar claims. If the court agrees, an injunction can cover everyone in the class. The requirements are real: the class must be too large for individual suits, share common questions, have typical claims and be fairly represented by the named plaintiffs. Class certification is a more disciplined way to reach many people, because the court has to decide who the class is.

The Administrative Procedure Act. The APA says a court reviewing agency action shall "hold unlawful and set aside" action that is arbitrary, capricious, or contrary to law. Many courts read "set aside" to mean the rule is vacated for everyone, the way a court throws out a bad statute, and not just for the plaintiffs. Others, including some judges, scholars and justices, doubt that reading. That fight touches on the question of how much deference courts owe agencies, which we cover in Chevron Is Gone, and Here Is What Loper Bright Changed for Everyone, and on who controls the agencies, covered in Who Can Fire the Regulators? A Timeline From Myers to Seila Law.

State plaintiffs. When states sue, they argue they are injured by a federal policy and need relief that covers their residents and programs, which can be broad in effect.

The path up: from district judge to the Supreme Court

What can the government do when a judge blocks its policy? There is a standard path, and knowing it protects you from the doom-and-glory headlines.

1. Ask the district judge to stay the order pending appeal. Usually the first move.
2. Appeal to the regional court of appeals. Federal law, 28 U.S.C. section 1292(a)(1), lets parties appeal orders granting or refusing injunctions right away, without waiting for the end of the case. The circuit can stay the order while it considers the appeal.
3. File an emergency application at the Supreme Court. It goes to the justice assigned to that circuit, who usually refers it to the full Court. The Solicitor General, the Justice Department official who represents the federal government before the Supreme Court, signs off on what the government files. This is the so-called emergency docket.
4. The Court rules on the application, or takes the case for full briefing and argument.

At each stage the same factors apply, and the judge must weigh the same equities. The Justice Department's role in all this is why the department's lawyers are the ones you see in headlines when an administration is blocked. For a deeper picture of how judges review presidential power in the first place, see Justice Jackson's Three-Box Test for Presidential Power, Put to Work, and for the foundation of the courts' power to review anything, Marbury v. Madison and the Power the Supreme Court Gave Itself in 1803.

The strongest objection: "Without universal relief, the government wins by default"

Now the other side's best argument, because it deserves a hearing. If a federal rule is plainly unlawful, the critic says, requiring millions of affected people to sue one by one is absurd. Most can't afford it. The government can keep enforcing an illegal rule against everyone who didn't file, and by the time the cases wind through the courts, the harm is done. A rule that applies to everyone, such as a labeling requirement, is practically impossible to enforce against one plaintiff and not the others. And an invalid rule is invalid for everybody; leaving it standing against non-parties is a kind of injustice.

I take that seriously, and part of it is right. Here is how I'd answer.

1. Class actions and APA review exist for exactly these cases. The tools are designed to reach many people, with procedures that protect fairness.
2. Appeals are available. A wrong order from one judge can be stopped by a higher court. A wrong order that blocks a good policy for everyone can do enormous damage before the appeal ends, which is why the scope matters.
3. The Constitution's structure favors dispersal. Madison's design, covered in Madison Built a Government Where Ambition Fights Ambition, and It Works, assumes that no single official, not a President and not a district judge, holds national power alone.
4. Predictability matters to ordinary people. The lumberyard owner in Ohio needs one answer, delivered by a process with clear rules, not a patchwork.

The bottom line

• A TRO lasts up to 14 days without notice, extendable for another 14 (28 in all), and a preliminary injunction requires proof of the four Winter factors: likely success, likely irreparable harm, balance of equities and the public interest.
• Equity is tied to history. Grupo Mexicano (1999) says federal courts may grant the relief that courts of equity could grant in 1789, and Bray's 2017 article argued that nationwide injunctions do not fit that history.
• Both parties have cheered and cursed single-judge orders, as the DAPA case in 2015 and the travel ban cases in 2017 and 2018 show. Judge the power by a rule you would accept for your opponents.
• Read the headline carefully: who are the plaintiffs, what does the order cover, has it been appealed, has it been stayed? The answers change what the order means for your family or your business.
• If you think a power is abused, the remedies are lawful ones: appeal, a class action, a better statute from Congress, or judges who read the law narrowly.