A second federal judge has ruled against the Trump administration’s decision to put a citizenship question on the 2020 census, setting up a likely challenge at the Supreme Court. U.S. District Judge Richard Seeborg of California ruled Wednesday that the move is unconstitutional because it prevents the government from carrying out its mandate of conducting the census every 10 years. In January, a federal judge in New York also ordered a halt to the census’s citizenship question, ruling U.S. Commerce Secretary Wilbur Ross violated federal rules and “alternately ignored, cherry-picked, or badly misconstrued the evidence in the record before him.” Voting rights activists say the question is meant to deter immigrants from participating in the census, leading to a vast undercount in states with large immigrant communities. This would impact everything from the redrawing of congressional maps to the allocation of federal funds.