The U.S. Supreme Court dealt a significant rebuke to former President Donald Trump on Monday by blocking his administration’s plan to have the Postal Service screen and potentially withhold mail-in ballots in the lead-up to elections. The court’s conservative majority, which had previously deferred ruling on the issue, indicated that the plan was likely unlawful, marking a notable moment of resistance to Trump’s efforts to tighten election procedures.

Earlier this year, the court had avoided making a final decision on the matter, suggesting that the issue was not yet properly before it. However, the latest ruling went beyond procedural concerns to cast doubt on the legitimacy of the administration’s policy itself. Election officials from both major parties had warned that the proposal could disenfranchise millions of voters by delaying or blocking the delivery of valid mail ballots.

Trump publicly criticized the Supreme Court following the decision, accusing his three appointees on the bench of succumbing to pressure from what he described as a "Radical Left" influence. He expressed disappointment that the court had not met his expectations, stating on social media that the justices “are merely a shell of their original selves.”

The ruling reflects a shift in the court’s approach toward Trump’s executive actions during his second term. While the administration had initially found substantial success with emergency applications—often ruled on through the court’s expedited “shadow docket”—those provisional victories have recently given way to setbacks. The court has rejected various Trump initiatives, including the deployment of the National Guard in Illinois, a key tariff policy, an attempt to remove a Federal Reserve governor, and limits on counting ballots arriving after Election Day.

The decision on mail ballots, brief yet impactful, diverged from Chief Justice John G. Roberts Jr.’s typical caution against deciding issues beyond what is necessary to resolve a case. Legal experts suggest this expanded ruling was motivated by a desire to prevent the contested postal policy from resurfacing in future elections.

Election administrators welcomed the court’s intervention but acknowledged lingering public confusion. Meghan Kuznik, Fayette County, Pennsylvania’s director of elections, described a “feeling of relief” among officials but noted that media coverage had stoked voter concerns about whether mail ballots would be counted.

Last week, the court also blocked another Trump administration attempt to modify Missouri’s early voting map in a way that would have favored Republicans, reinforcing the court’s reluctance to endorse last-minute election changes. Additionally, the court is considering a related case that could permit the use of Social Security data to verify voter citizenship, illustrating the administration’s broad and simultaneous legal challenges to election rules.

Legal observers say the court’s recent rulings signal a reluctance to accommodate significant last-minute electoral adjustments from the administration moving forward. According to Justin Levitt, a law professor at Loyola Marymount University, the message is clear: election rules will stand as established, and the outcome will be determined by voters rather than by sudden procedural shifts.