The Trump administration on Friday appealed a freeze on President Trump’s plan to restrict mail-in voting, setting up more legal battles over whether the U.S. Postal Service can change ballot handling before the midterms. The issue will likely reach the Supreme Court.

The appeal came a day after a federal judge in Massachusetts ruled that a Postal Service rule published last week was likely unconstitutional and exceeded the agency’s authority. The rule would block mail ballots in states that don’t share voter data with the agency and only allow deliveries meeting certain criteria.

The Supreme Court had previously declined to hear the case, saying it was too soon to challenge an executive order from March because the Postal Service hadn’t acted yet. After the rule was published, more than 20 Democratic state attorneys general and voting nonprofits returned to court with a concrete challenge.

The administration argued the rule doesn’t give the Postal Service an intrusive role in elections. “The Postal Service will not determine voter eligibility, ballot content, mailing or receipt deadlines, or ballot-counting procedures,” the agency said. In her ruling, Judge Indira Talwani wrote that while the Supreme Court found the issue not ripe, it was still unclear if the plan was lawful—and she concluded it likely wasn’t.