A federal judge in California handed the Trump administration its first major legal defeat on Thursday in a nationwide effort to force states to turn over sensitive voter registration information.

U.S. District Judge David O. Carter, an appointee of former President Bill Clinton, dismissed a Justice Department lawsuit that sought access to California’s unredacted voter file, including highly personal data such as Social Security numbers and driver’s license information. The ruling is the first decision in a series of similar cases the administration has filed against more than 20 states.