A boost to Democrats in a state that’s poised to play a decisive role the 2020 presidential race. Trump won Wisconsin by fewer than 23,000 votes in 2016.
The Wisconsin Institute for Law & Liberty, said it plans to appeal the ruling to the state Supreme Court.
A lower court judge in January ordered the purging of more than 200,000 people from voter rolls because they may have moved.
On Friday, the appeals court also overturned an order by the same judge that had found the state elections commission in contempt for not moving forward with the voter roll purge.
The plaintiffs in the original case argued that the state elections commission should have immediately deactivated registered voters who didn’t respond within 30 days to a mailing sent in October, an indication that the person may have moved.