The California Legislature hired former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE as it prepares for expected battles with President-elect Donald Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE's administration, The New York Times reported Wednesday.

Numerous cities in the state are sanctuary cities, and Democrats have been gearing up to battle Trump's immigration policies that would affect the state's more than 2.6 million undocumented residents.

“Having the former attorney general of the United States brings us a lot of firepower in order to prepare to safeguard the values of the people of California,” Kevin de León, the Democratic leader of the Senate, told The New York Times. “This means we are very, very serious.”

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De León said he expected California to challenge Washington on issues including the environment, immigration and criminal justice.

“It was very clear that it wasn’t just campaign rhetoric,” de León said of Trump’s policy proposals on the campaign trail. “He was surrounding himself with people who are a very clear and present danger to the economic prosperity of California.”

Former Rep. Xavier Becerra Xavier BecerraOVERNIGHT ENERGY: Trump casts doubt on climate change science during briefing on wildfires | Biden attacks Trump's climate record amid Western wildfires, lays out his plan | 20 states sue EPA over methane emissions standards rollback 20 states sue EPA over methane emissions standards rollback Investigation underway after bags of mail found dumped in Los Angeles-area parking lot MORE (D-Calif.) was appointed to be the state attorney general, replacing incoming Sen. Kamala Harris (D-Calif.). Becerra, now one of the highest-ranking Latino officials in California, will also play a key role in battles with Trump.

Holder served as President Obama's attorney general from 2009 to 2015, the first African-American in the position. He has since worked as a partner at a law firm in Washington that focuses on representing companies and states in cases against the federal government.

“I am honored that the Legislature chose Covington to serve as its legal adviser as it considers how to respond to potential changes in federal law that could impact California’s residents and policy priorities,” Holder said in a statement.

“I am confident that our expertise across a wide array of federal legal and regulatory issues will be a great resource to the Legislature.”