The Trump administration on Friday appealed a freeze on President Trump’s plan to restrict mail-in voting, teeing up another series of legal decisions about whether the U.S. Postal Service can make changes to how ballots are handled ahead of the midterm elections.

The issue will likely be settled by the Supreme Court.

The administration’s appeal came less than a day after a federal judge in Massachusetts found that a Postal Service rule published last week was likely unconstitutional and exceeded the agency’s authority. Under the rule, the Postal Service would not deliver mail ballots in states that do not share voter data with the agency, and would only deliver ballots that meet certain criteria.

The Supreme Court has considered the issue once already, finding that it was too soon for litigants to challenge an executive order issued by Mr. Trump in March because the Postal Service had not yet taken steps to carry it out.

But after the Postal Service published its plan last week, more than 20 Democratic state attorneys general and a coalition of voting nonprofits and organizations returned to court with a more concrete challenge.

The Trump administration had argued that the Postal Service plan would not give the agency an overly intrusive role scrutinizing voters or regulating election mail.

“The Postal Service will not determine voter eligibility, ballot content, mailing or receipt deadlines, or ballot-counting procedures,” the agency said in a filing.

In a ruling on Thursday, Judge Indira Talwani of the Federal District Court for the District of Massachusetts wrote that while the Supreme Court had previously said the issue was not ripe, the justices had also concluded that it was not yet clear if the administration’s plan was lawful. She wrote that it was likely not.