House Minority Leader Nancy Pelosi Nancy PelosiAs families deal with coronavirus, new federal dollars should follow the student Sunday shows - Ruth Bader Ginsburg's death dominates Hypocrisy rules on both sides over replacing Justice Ginsburg MORE (D-Calif.) vowed on Wednesday to fight the Trump administration's efforts to sue California over the state's sanctuary laws, declaring that Californians would not cave to "intimidation tactics."

"The people of California will not be bowed by the Trump Administration's brazen aggression and intimidation tactics," Pelosi tweeted. "We will fight this sham lawsuit and will fight all cowardly attacks on our immigrant communities."

The people of California will not be bowed by the Trump Administration's brazen aggression and intimidation tactics. We will fight this sham lawsuit and will fight all cowardly attacks on our immigrant communities. #ProtectDREAMers — Nancy Pelosi (@NancyPelosi) March 7, 2018

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The Justice Department filed a lawsuit on Tuesday aiming to block three laws passed by California lawmakers in recent months, arguing in court documents that those laws are intended to obstruct federal officials from enforcing immigration laws.

Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE delivered a scathing assessment of the laws on Wednesday, accusing California of blatantly trying to undermine the authority of the federal government.

"There is no nullification. There is no secession," Sessions said during a speech in Sacramento on Wednesday. "Federal law is the supreme law of the land."

Sen. Kamala Harris Kamala HarrisSocial Security and Medicare are on the ballot this November Harris honors Ginsburg, visits Supreme Court The Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins MORE (D-Calif.) accused Sessions and President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE of trying to "bully" her home state, but asserted that their efforts would ultimately fall flat.

"Trump and Sessions think they can bully California — but it won't work," Harris wrote on Twitter.

Trump and Sessions think they can bully California -- but it won't work. https://t.co/xf85HpSOqe — Kamala Harris (@KamalaHarris) March 7, 2018

The Justice Department's move to sue California marked its most aggressive effort yet to clamp down on states that have acted in opposition to Trump's hard-line stance on immigration.