The U.S. Department of Justice in a Tuesday news release said Sessions will make the announcement while speaking at the 26th Annual Law Enforcement Legislative Day hosted by the California Police Officers' Association.
In addition, Gov. Jerry Brown signed legislation a year ago imposing limits statewide on cooperation with federal immigration officials, although there are exceptions.
U.S. Immigration and Customs Enforcement acting director Tomas Homan has threatened increased enforcement in California in the wake of SB 54. Agents still arrested more than 200 residents for alleged immigration violations.
California Attorney General Xavier Becerra said law enforcement in the state is focused on public safety, not deportation.
The defendants named in the lawsuit are the state of California, Gov.
Sessions plans to discuss the lawsuit during a speech he is scheduled to give on Wednesday at a law enforcement conference in Sacramento.
The lawsuit, filed late Tuesday in federal court, is taking aim at "sanctuary" policies in the Golden state that are meant to protect undocumented immigrants from deportation.
Gen. Jeff Sessions is suing CA because we refuse to help the Trump administration tear apart honest, hardworking immigrant families.
The third law empowers the state to inspect federal immigration detention centers.
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The Justice Department has said it's confident the Constitution's Supremacy Clause gives it broad authority to supersede state laws that it says interfere with its immigration enforcement obligations.
"I think the record will speak for itself that we've proven that not only is California doing things the way it should, but we've also proven that on numerous occasions, the Trump administration has acted outside the law", Becerra said.
The pending DOJ lawsuit is a separate legal matter from challenges against the Trump administration's threats to withhold federal grants from jurisdictions over "sanctuary" policies, which are playing out in courts in California and IL.
"We do, however, have a sworn duty to protect our communities from the release of potentially unsafe criminals, wherever they may come from", said current president of CPOA, Beverly Hills Police Department Assistant Chief Marc Coopwood in a September statement.
A senior Justice Department official said department lawyers are still evaluating other places' laws and could bring other lawsuits - although the measures California passed stood out as being especially high-profile and transgressive of what Sessions thought was constitutional.
Sessions has blamed sanctuary city policies for crime and gang violence and announced in July that cities and states could only receive certain grants if they cooperate with immigration agents.
The groups' members have often been split on sanctuary policies.
Protesters from labor unions, Democratic Party and immigrant rights organizations planned to rally along with some state and local elected officials outside the hotel where Sessions will speak.
Supporters of the California laws and "sanctuary" policies in general argue that they make communities safer by allowing local police to work better with immigrant communities and focus time and resources on duties other than immigration matters.