Besides California, other states could feel the impact of the decision.

Illinois is another state on the borderline of losing a House seat. An undercount in urban areas like Chicago or Aurora, which have large immigration populations, could make that a reality.

Additionally, Arizona and Colorado were predicted to gain a House seat after the 2020 census. That could change with this new question on the form.

Texas was predicted to get two or three seats in a post-census map. The Lone Star State could lose one or two of those. Florida was predicted to gain two seats and that could change also.

Then there are states that don’t seem likely candidates for being impacted by this but could be, such as Alabama, which is on the verge of losing a seat.

“Alabama doesn't have a large immigrant community, but it also wouldn't take a lot to impact it. And since the one Democratic district in Alabama is a majority-minority district, the lost seat would almost certainly be one that Republicans currently control,” said Michael Li, a redistricting expert at the Brennan Center for Justice.

The Redistricting Process

In 2016, the U.S. Supreme Court ruled unanimously in Evenwel v. Abbott that the total population of a place can determine the lines of its districts, a defeat for conservative groups that wanted the lines determined by the number of people eligible to vote.

Some strategists worried Republicans could use the results from the 2020 census to argue non-citizens should not be counted toward the determination of voting lines.

That would be a “killer for Democrats,” one expert on voting told ABC News.

“There is nothing stopping anyone at this junction to trying to challenge the Evenwel decision,” said Vanita Gupta, a former Justice Department attorney under President Obama who is now president of the Leadership Conference on Civil and Human Rights.

But, she added, “the census exists for one purpose and one purpose only and that is to count every person in the country.”

Brace points out that “we’re undergoing a sea change in how we’re looking at redistricting.”

The U.S. Supreme Court recently declined a Republican-backed request to put a hold on the new Pennsylvania congressional map after the state’s high court ruled it had to be redrawn because it constituted an illegal gerrymander which favored the GOP.

But including a citizenship question on the census form could swing the redistricting process back in the GOP’s favor if it suppresses the illegal immigration population from participating, Brace said.

“We’ve got this pendulum going back conceivably toward the Democratic side. Would the citizenship issue cut short that pendulum swing? That’s a possibility,” Brace said.

The Legal Fallout

Legal scholars argue that the constitution requires the entire population of the United States to be counted. They cite Article I, Section 2 which calls for the “actual Enumeration” of the population.

“The Constitution requires the government to conduct an ‘actual enumeration’ of the total population, regardless of citizenship status. And since 1790, the census has counted citizens and noncitizens alike,” Becerra and California Secretary of State Alex Padilla wrote in the San Francisco Chronicle.

Former attorney general Eric Holder, the chairman of the National Democratic Redistricting Committee, said his group will sue the administration over the decision.

“Contrary to the Administration’s stated rationale, asking the citizenship question on the census is not critical to enforcing the Voting Rights Act. As attorney general, I did not — nor did my predecessors — request the addition of a citizenship question to the decennial census to enforce the VRA. We did not need to: Data derived from the existing census process was perfectly adequate for any voting litigation that arose,” he said in a statement.

The NAACP and Prince George’s County, Maryland — one of the largest predominately black counties in the country — also announced plans to sue.

Mike Gonzalez, a senior fellow at The Heritage Foundation, when asked if the total population should be counted, pointed out “they will be” because there won’t be a suppression among non-citizens. He called the decision a “small change.”

“This is not as a big as deal as they are making it out to be. This is a very simple thing that is traditionally asked,” he said.

Those who support including the question point out that the American Community Survey – a yearly survey of U.S. households – does include a citizenship question.

The survey goes out to roughly 3.54 million houses and its results are not used in the reapportionment process that determines the distribution of House districts. The 2010 census found that 300.8 million people lived in 116.7 million households.

Another concern is that field tests for the 2020 U.S. Census are currently underway in Providence, Rhode Island, and there won’t be time to include the citizenship question in those tests. And because the question cannot be tested, its effect cannot be determined.

Terri Ann Lowenthal, a policy advisor to The Leadership Conference Education Fund, said: “they basically will be going into this census with a blindfold on.”

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