President Donald Trump was handed a setback in his quest to alter mail-in voting policy in federal elections on Saturday by a federal appeals court.

The 1st U.S. Circuit Court of Appeals in Boston declined to lift an injunction blocking key provisions of a March executive order that sought to alter rules around mail-in ballots ahead of November’s midterm elections. U.S. District Judge Indira Talwani had ruled in late June that several parts of the order were unconstitutional after 23 Democratic states and the District of Columbia sued the Trump administration.