The Trump administration filed an emergency application with the Supreme Court on Sunday seeking to implement new U.S. Postal Service rules restricting mail-in voting before the midterm elections. Solicitor General D. John Sauer argued the rules impose "reasonable preparation requirements" and do not seize control of state elections. Justice Ketanji Brown Jackson, handling the emergency request, set a response deadline of Wednesday at 4 p.m. for challengers but did not grant the administration's request to allow the rules to take effect immediately, leaving a federal judge's freeze in place.

U.S. District Judge Indira Talwani in Boston had indefinitely blocked the Postal Service plan on Friday, ruling that Democratic-led states and voter rights groups were likely to succeed on claims the rule violates the Constitution's separation of powers. Judge Talwani wrote the administration sought to "avoid" the separation of powers issue by "denying that the final rule is an election rule," adding, "This denial rings hollow." She also found Congress never delegated its Elections Clause power to the USPS.

The legal battle creates urgency as states begin distributing mail-in ballots. The Supreme Court will have the final say on President Trump's push to restrict mail voting, though the timeline for a ruling remains unclear. Emergency requests are typically decided quickly without full briefing or argument, marking this as the likely final legal showdown before the midterms.