Tom Homan, ICE acting director, said SB54 makes California a sanctuary state for undocumented immigrants, including those who have committed crimes, and almost eliminates all cooperation with local police and its agents.
"Sanctuary policies endanger us all, and especially the federal immigration officers who are forced to pursue criminal aliens outside of jails and prisons", Sessions said in a speech to federal law enforcement officials in September.
Meanwhile, the state law enforcement can only detain someone in a request from the federal government, notifying the latter to release or transfer someone to federal custody, after there's a felony warrant or the person has been convicted of one of the over 800 crimes listed on the bill.
Federal judges have also temporarily blocked the president's January executive order that sought to restrict federal funding to what are known as sanctuary cities, which limit their cooperation with immigration agents.
With Gov. Jerry Brown's signature on SB 54, California now calls itself a sanctuary state.
The Department of Homeland Security's Immigration and Customs Enforcement agency rebuked Gov.
De Leon said the Trump administration attempts to create division through fear-mongering. At a first-of-its-kind immigration forum in March, Sacramento protesters booed and heckled Homan, leading the acting ICE head to tell the roiling crowd that, "We don't conduct neighborhood sweeps".
"ICE will also likely have to detain individuals arrested in California in detention facilities outside of the state, far from any family they may have", he said in a statement.
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A number of cities in California, such as Los Angeles and San Francisco, have already banned police officers from collaborating with ICE on operations to capture undocumented immigrants.
In anticipation of stepped-up raids, lawmakers passed a collection of other bills aimed at resisting Trump's immigration agenda.
"No one at this point believes that ICE is remotely interested in public safety - and ironically their threats only make more clear the need for localities and states to enact better policies to uphold the law", Sarmiento said.
The California State Sheriff's Association strongly opposed SB 54 saying, among other things, it protects so-called non-violent offenders including gang members, drug dealers and sex offenders from deportation. "But it will put a kink - a large kink - in Trump's perverse and inhumane deportation machine", De León said Thursday after Governor Brown signed the bill.
"It protects public safety but it also protects hardworking people who contribute a lot to California", Brown told CNN, adding, "the [ICE] can come into our jails, they can interview people, they can pick up people they think are appropriate".
California Attorney General Xavier Becerra said he stands ready to fully defend the law.
Asked for a comment about the bill, White House Press Secretary Sarah Huckabee Sanders said the Trump administration is "spending every day we can trying to find the best way forward".