Opinion: The Postal Service ruling is another warning about changing election rules at the last minute

When the Supreme Court declined this week to let the Trump administration enforce a new Postal Service rule on mail-ballot envelopes, the most notable words in the order did not come from the dissent. They came from Justice Brett Kavanaugh, who voted with the majority to block the rule not because he doubted the government's underlying authority, but because he found the timing indefensible: state and local election officials, he wrote, "do not have sufficient time to reasonably implement the rule before the elections." That single sentence is worth more attention than the 7-2 vote count, because it reflects a pattern that has outlasted several administrations and both parties: election rules imposed close to Election Day tend to lose in court, on process grounds, whatever their merits.

A doctrine older than this dispute

Courts have a name for the caution Kavanaugh expressed. It traces back most directly to Purcell v. Gonzalez, the Supreme Court's 2006 order that federal courts should be wary of changing election procedures in the weeks before a vote, because late changes confuse voters and strain the officials who have to administer them. The doctrine has since been invoked to block rule changes sought by Democratic-appointed and Republican-appointed officials alike, in redistricting fights, voter-ID disputes and absentee-ballot cases stretching back nearly two decades. What makes this week's case notable is not that the "Purcell principle" applied — it almost always does, in some form, this close to a federal election — but that a rule change initiated by the federal government itself, not a state legislature or a lower court, ran into the same wall.

The rule at issue was not obviously unreasonable on its face. Requiring standardized barcodes and scannable envelope designs for ballot mail is the kind of modernization the Postal Service has pursued for ordinary mail for years, and Kavanaugh's concurrence pointedly left open "a fair prospect" that such a rule could survive review under different circumstances. The problem was sequencing: a final rule published August 26, with ballots already entering the mail in some states, gave election offices weeks rather than months to redesign envelope specifications, reprogram scanning equipment and retrain staff, according to the Court's order in USPS v. California. Compliance on that timeline was, in the district court's words, not merely inconvenient but a real risk to the roughly 30 percent of the electorate that now votes by mail nationwide, a share confirmed in the U.S. Election Assistance Commission's most recent nationwide survey of election administration.

The cost falls on election offices, not partisans

It is tempting to read this ruling purely along partisan lines, since the administration that wrote the rule and the states that challenged it fall along predictable lines. But the people who actually have to make election rules work are, for the most part, neither: county clerks, state election directors and postal workers who do not get a vote on the policy and only find out how much time they have to implement it when the rule is finally published. Pennsylvania's own guidance to voters on how to request and return a mail ballot illustrates how much administrative machinery already sits underneath a single ballot envelope — deadlines, verification steps, drop-box logistics — before a federal mandate is layered on top of it. When a rule arrives with ten weeks' notice instead of ten months, it is local officials, not the political appointees who wrote the regulation, who absorb the resulting chaos.

That imbalance is why the timing-focused objection, echoed by justices across the ideological spectrum in past election cases, deserves to be treated as more than a technicality. A rule that might well be lawful in the abstract can still be bad policy if it is imposed too close to an election to be executed competently. Judges are not well positioned to evaluate whether a barcode requirement improves election security; they are well positioned to notice that seventy days is not enough time to retool a nationwide mail-sorting process without risking the ballots of people who did nothing wrong.

A better fix does not run through emergency dockets

The recurring nature of these disputes points to a structural problem that a single Supreme Court order cannot solve. Federal rules touching mail voting keep arriving in the same compressed window before elections, and they keep landing in front of judges asked to make consequential decisions on emergency timelines, with limited briefing and no chance to develop a full factual record. That is a poor way to set the rules for how tens of millions of Americans cast a ballot. If Washington believes ballot-mail standardization is worth pursuing, the more durable path is ordinary rulemaking on a timeline that gives state election offices a full election cycle, not a matter of weeks, to adapt, and ideally the kind of advance congressional authorization that would remove the recurring argument over whether the Postal Service has the power to regulate election mail at all. Litigating that question anew before every federal election, under Purcell's shadow, serves no one — not the administration proposing a rule, not the states resisting it, and least of all the voters and poll workers caught in between.