(3 Apr 2018) Seventeen states, the District of Columbia and six cities sued the U.S. government Tuesday, saying a plan to add a citizenship demand to the census questionnaire is unconstitutional. The lawsuit, filed Tuesday in Manhattan federal court, said adding the citizenship demand to the 2020 census questionnaire was an arbitrary decision that will "fatally undermine the accuracy of the population count." In a press conference Tuesday, New York Attorney General Eric Schneiderman said "the Trump administration is out to destroy this bipartisan tradition." Several states already have joined a separate lawsuit filed by California's attorney general last week that seeks to block the citizenship question from being added to the census questionnaire. The NAACP says the plans for the census will lead to a massive undercounting of blacks. A government spokesman did not immediately comment on the filing. Find out more about AP Archive: http://www.aparchive.com/HowWeWork Twitter: / ap_archive Facebook: / aparchives Instagram: / apnews You can license this story through AP Archive: http://www.aparchive.com/metadata/you...