"The law requires that everyone in America, whether citizen or not, be counted," Becerra said in a virtual news conference Tuesday morning. "Not even the president of the United States can sidestep the U.S. Constitution."
Last week, Trump issued a memorandum ordering undocumented immigrants not be counted when it comes to determining states' congressional seats.
Los Angeles City Attorney Mike Feuer says it's clear Trump is targeting California.
RELATED: LA County residents lag California in responding to 2020 Census
"His primary objective is to rip political power away from jurisdictions that have many immigrants to those locations that don't," said Feuer. "We are going to do our job in court. This latest move by the president is blatantly unconstitutional. Every person regardless of immigration status counts."
Right now, California has more than two million undocumented immigrants and 53 seats in Congress. Experts warn if those people are not counted, California could lose one or two seats at the Capitol. A low census count would also cost the state federal funding.
"It would try to prevent California from having its full representation in Congress, and it would try to deny Californians their taxpayer money that they contribute to the U.S. Treasury coming back to their communities," Becerra asserted.
Eyewitness News reached out to the White House for comment on California's latest lawsuit. Our request has gone unanswered.
Becerra believes the goal was really just to bully undocumented immigrants.
"What he's doing is really telegraphing an effort to intimidate people, an effort to scare people into not participating in the census," said Becerra.
The state of California is being joined in the lawsuit by the cities of Los Angeles, Long Beach and Oakland. The lawsuit was filed in the U.S. District Court for the Northern District of California.
Because of the coronavirus pandemic, the government has extended the deadline for taking part in the census to Oct. 31st. But with little more than three months left, 40% of U.S. households still have not participated.