The U.S. Supreme Court declined to let the U.S. Postal Service enforce the Trump administration’s mail-ballot rule, leaving in place an injunction issued by Boston-based U.S. District Judge Indira Talwani as legal challenges by states and voting-rights groups proceed. The rule would require states to provide USPS with lists of mail-ballot recipients and use agency-approved outbound and return envelopes with unique barcodes, allowing the agency to refuse noncompliant ballots. U.S. District Judge Carl Nichols separately issued a preliminary injunction in Washington, D.C., on Sunday, finding that key provisions exceeded USPS authority and could make voting by mail harder. Justice Samuel Alito, joined by Justice Clarence Thomas, dissented. The administration says the measure would prevent voter fraud, while critics and courts have warned it could disrupt legitimate ballots before the Nov. 3 midterm elections.