In Maryland, where almost 15 percent of people are foreign-born and around 250,000 are undocumented, Attorney General Brian Frosh said the question would result in the loss of federal funds for the state and deprive it of fair representation in Congress.
"For decades, administrations from both parties have treated this constitutional requirement with the respect and reverence it deserves", he continued.
Mr. Schneiderman's lawsuit joins one by California Attorney General Xavier Becerra, who filed his challenge less than three hours after the Trump administration announced the citizenship question on March 26.
The lawsuit accuses Commerce Secretary Wilbur Ross - whose department oversees the census - of knowingly adding a question to "deter participation" and "undermine the decennial population count".
Under the Constitution, the Census Bureau has an obligation to determine "the whole number of persons in each state".
Tom Cochran, executive director of the U.S. Conference of Mayors, which represents mayors of cities with 30,000 or more residents, said the addition of the question could hurt cities regardless of party.
Attorney General Jeff Sessions claimed that the citizenship question would help federal prosecutors enforce the Voting Right Act, but Schneiderman noted that the anti-immigration hawk has not prosecuted one case under that statute.
It asked for a ruling that the citizenship demand is unauthorized and unconstitutional. Obtaining the cooperation of a suspicious and fearful population would be impossible if the group being counted perceived any possibility of the information being used against them.
U.S. Rep. Carolyn Maloney predicted the lawsuit will end before the U.S. Supreme Court.
In 2009, all eight former Directors of the Census Bureau dating back to 1979 - who served under both Democratic and Republican presidents - affirmed that a citizenship question would depress participation and lead to a significant undercount, undermining the objective of the census itself.
"Without an accurate count, Seattle could lose billions of dollars of federal investments in housing, schools, and hospitals, and other critical federal resources".
"The United States Constitution requires a full count of all residents, whether they are citizens or not", said Shapiro. As a result, an undercount of population in states that are home to large immigrant communities will impair fair representation, a principle fundamental to the fabric of our democracy.
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