"The U.S. Justice Department sued California, escalating a war over the Trump administration’s crackdown on undocumented immigration."

"Specifically, the statutes at issue restrict state and local law enforcement entities, as well as private employers, from sharing information about undocumented immigrants with federal agencies including Immigration and Customs Enforcement, the Justice Department said in the lawsuit."

https://www.bloomberg.com/news/articles/2018-03-07/u-s-sues-california-to-nullify-three-immigration-related-laws