A group of 17 blue states and 6 cities filed a lawsuit against the Department of Commerce today, alleging that the inclusion of a citizenship question in the 2020 Census will "significantly [deter] participation in immigrant communities, because of concerns about how the federal government will use citizenship information."

Who they are: Connecticut, Delaware, Illinois, Iowa, Maryland, Massachusetts, Minnesota, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Rhode Island, Vermont, Virginia, and Washington — along with the District of Columbia; the cities of Chicago, New York, Philadelphia, Providence, Seattle and San Francisco; and the United States Conference of Mayors. California has already filed a similar lawsuit against the administration.