U.S. Attorney General Jeff Sessions spoke Wednesday morning in downtown Sacramento at a law enforcement officers' conference, telling California, "We have a problem" as it relates to illegal immigration.Sessions told law enforcement officers that the Justice Department sued California because state laws are preventing federal immigration agents from doing their jobs.California leaders strongly deny that claim.Sessions said several California state laws prevent U.S. Immigration and Customs Enforcement officers from making deportation arrests and singled out elected officials for their actions. He had particularly strong words for Oakland Mayor Libby Schaaf, who issued an unusual public warning last month about an immigration operation.++Gov. Brown offers fiery rebuke of Jeff Sessions' speech"How dare you?" he said of Schaaf at a California Peace Officers Association meeting in Sacramento. "How dare you needlessly endanger the lives of law enforcement just to promote your radical open borders agenda?" The Justice Department, in a federal lawsuit filed Tuesday in Sacramento, is challenging three California laws that bar police from asking people about their citizenship status or participating in federal immigration enforcement activities."It wasn't something I chose to do, but I can't sit by idly while the lawful authority of federal officers are being blocked by legislative acts and politicians," Sessions said, straying from his prepared remarks.More than a dozen attendees in a room of about 200 people gave the attorney general a standing ovation.The lawsuit is the latest salvo in an escalating feud between the Trump administration and California, which has resisted the president on issues from taxes to marijuana policy and defiantly refuses to help federal agents detain and deport immigrants. U.S. Immigration and Customs Enforcement has said it will increase its presence in California, and Sessions wants to cut off funding to jurisdictions that won't cooperate.During a fiery response to Sessions' speech, Brown claimed Sessions of lying and trying to appease Trump."This is a political stung. It's more like Fox News and what's going on in Washington," Brown said. "There's been a lot of concern about foreign people who sew division and discord. Now we have the attorney general doing precisely that. And like so many in the Trump administration, this attorney general has no regard for the truth. What he said earlier today is not true."The lawsuit was filed as the Justice Department also reviews Schaaf's decision to warn of an immigration sweep in advance, which ICE said allowed hundreds of immigrants to elude detention. Schaaf said Tuesday that the city would "continue to inform all residents about their constitutional rights."The California laws were passed in response to Trump's promises to sharply ramp up the deportation of people living in the U.S. illegally.One prohibits employers from letting immigration agents enter worksites or view employee files without a subpoena or warrant, an effort to prevent workplace raids. Another stops local governments from contracting with for-profit companies and ICE to hold immigrants. Justice Department officials said that violates the Constitution's supremacy clause, which renders invalid state laws that conflict with federal ones.The Supreme Court reinforced the federal government's primacy in enforcing immigration law when it blocked much of Arizona's tough 2010 immigration law on similar grounds. The high court found several key provisions undermined federal immigration law, though it upheld a provision requiring officers, while enforcing other laws, to question the immigration status of people suspected of being in the country illegally.In this case, California "has chosen to purposefully contradict the will and responsibility of Congress to protect our homeland," Homeland Security Secretary Kirstjen Nielsen said in a statement.Sessions, who has blamed sanctuary city policies for crime and gang violence, spoke Wednesday to groups representing police chiefs, sheriffs, district attorneys, narcotics investigators and the California Highway Patrol. Only the California State Sheriffs' Association actively opposed the so-called sanctuary law.Dozens of demonstrators chanted "stand up, fight back" and "no justice, no peace" outside the hotel where the meeting was held and some blocked traffic on a major thoroughfare. A heavy police presence was on hand.Demonstrator Henry Gordon of Sacramento said he hopes Sessions gets the message that Californians will resist efforts to separate families and deport immigrants.California Attorney General Xavier Becerra, who is up for election in November, said sanctuary policies increase public safety by promoting trust between immigrant communities and law enforcement, while allowing police resources to be used to fight other crimes."We're in the business of public safety, not deportation," he said.