A Democratic group headed by former U.S. Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE will go to court over a decision by the Commerce Department to include a question about citizenship on the 2020 census.

Holder said Tuesday that the group, the National Democratic Redistricting Committee, would fight the Trump administration's decision, arguing that including a citizenship question would drastically lower the response rate on the 2020 census and lead to an inaccurate count.

"We will litigate to stop the Administration from moving forward with this irresponsible decision," Holder said. "The addition of a citizenship question to the census questionnaire is a direct attack on our representative democracy."

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Holder's announcement came a day after Commerce Secretary Wilbur Ross Wilbur Louis RossTrump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE said that the Census Bureau would reinstate a question about individuals' citizenship status on the 2020 census, despite objections from Democrats on the matter.

Under Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE, the Justice Department has argued that including such a question would help it enforce the 1965 Voting Rights Act, a notion Holder rejected.

"Make no mistake — this decision is motivated purely by politics," Holder said. "In deciding to add this question without even testing its effects, the Administration is departing from decades of census policy and ignoring the warnings of census experts."

California Attorney General Xavier Becerra Xavier BecerraOVERNIGHT ENERGY: Trump casts doubt on climate change science during briefing on wildfires | Biden attacks Trump's climate record amid Western wildfires, lays out his plan | 20 states sue EPA over methane emissions standards rollback 20 states sue EPA over methane emissions standards rollback Investigation underway after bags of mail found dumped in Los Angeles-area parking lot MORE (D) also said late Monday that he would file a lawsuit over the Commerce Department's decision.

"We're prepared to do what we must to protect California from a deficient Census," Becerra said in a statement. "Including a citizenship question on the 2020 census is not just a bad idea — it is illegal."