The U.S. Postal Service applies a postmark to indicate the date and location of the processing facility where a mailpiece was first handled. Historically, postmarks were assumed to reflect the date a letter was dropped in a mailbox or handed to a postal clerk. That assumption is now outdated. Effective December 24, 2025, USPS clarified that postmarks generally reflect the date a mailpiece is first processed at a USPS facility — not the date it was mailed or collected by a carrier. Under the agency’s Delivering for America plan, which consolidated processing centers and rerouted mail transportation, a piece of mail may be postmarked a day or more after it was actually dropped off, especially if it must travel to a regional processing center before receiving a date stamp. (RELATED: Postal Service Poised To Allow Handguns In Mail After DOJ Memo)

Think about what that means for elections. A voter who drops a ballot in a mailbox the day after Election Day could receive an Election Day postmark if her local post office doesn’t process outgoing mail until the following morning. Conversely, a voter who mails her ballot on Election Day from a rural collection box might get a postmark dated the next day, or two days later, because USPS did not route it to the processing center in time. The majority built its entire framework on a timestamp that the Postal Service itself admits is unreliable.

There are workarounds, of course. A voter can go to a USPS retail counter and request a manual postmark applied by a clerk on the spot, free of charge. A voter can purchase a Certificate of Mailing or use Certified Mail to create a paper trail of when the Postal Service first accepted the envelope. But requiring 160 million voters to navigate these bureaucratic options just to prove they voted on the right day is absurd, and it’s a burden that falls hardest on rural voters, elderly voters, and anyone without easy access to a post office counter. The majority opinion doesn’t grapple with any of this. It simply assumes that “postmarked on Election Day” equals “mailed on Election Day.” That equation no longer holds.

Here’s what keeps me up at night as someone who has worked in election administration: this opinion has no limiting principle. Justice Alito calls it “Pandora’s box,” and he’s right. The case involved Mississippi’s five-day grace period, but nothing in the Court’s reasoning depends on that number. Washington State already counts ballots arriving twenty-one days after the election. What stops a state from scrapping receipt deadlines altogether? What stops a state from letting party operatives collect ballots on Election Day and deliver them whenever they get around to it? And here is a wrinkle the majority barely addresses: the Postal Service lets you recall mail mid-transit. So, a voter’s “choice” is supposedly final at the mailbox — except it isn’t, because you can take it back the next morning. Good luck explaining that to a county clerk trying to certify results.

Let’s be blunt about what this decision enables. The Carter-Baker Commission, chaired by a Democratic former president, found in 2005 that absentee voting was “the largest source of potential voter fraud” in American elections. Justice Stevens, no conservative, acknowledged in Crawford that the risk is “real.” Now imagine a close race where everyone can see the margin on election night. Ballots keep arriving for days or weeks. Bad actors know exactly how many votes they need. Justice Kavanaugh put it well: when “thousands of absentee ballots flow in after election day and potentially flip the result of an election,” “charges of a rigged election can explode.” We’ve seen this movie before. Lyndon Johnson’s Senate career was built on 202 late-arriving votes that flipped a 1948 race result, now widely understood to have been stolen. And even absent fraud, the mere appearance of it corrodes democracy. Research shows that drawn-out counting “induces a large, significant decrease” in Americans’ trust in elections.

The majority itself concedes that if “varied deadlines for ballot receipt similarly call for a national solution, the American people must choose it through their elected representatives.” Fine. I’ll take them at their word.

President Trump called today’s ruling a “tremendous loss” for voters’ rights and urged Congress to act immediately. He’s right. It is more important than ever to pass the SAVE America Act. The bill would require photo ID and proof of U.S. citizenship to vote in federal elections, limit mail-in voting to traditional absentee exceptions and other unusual circumstances and restore the common-sense principle the Court abandoned today: that ballots must be received by the close of polls on Election Day. One day. One deadline. One set of rules Americans can understand and trust.

The House has done its job. The Senate needs to do the same — and fast. After today, every state legislature in the country knows it can push ballot-receipt deadlines as far out as it wants and allow mail-in voting to expand without limit. The Framers gave Congress the power over election timing precisely because they knew the states couldn’t be trusted to resist the temptation to game it. Four Justices saw that clearly. The President sees it clearly. Fifty-one Senators need to see it too.

Trey Trainor is a partner at Dhillon Law Group, Inc. and certified in Legislative and Campaign Law by the Texas Board of Legal Specialization. He served as a Commissioner on the Federal Election Commission from 2020 to 2025.

The views and opinions expressed in this commentary are those of the author and do not reflect the official position of the Daily Caller.