Louisiana Attorney General Liz Murrill is pushing forward with her efforts to force Orleans Parish Sheriff Susan Hutson to drop a longtime policy that generally prohibits deputies from directly engaging in federal immigration enforcement within the city’s jail.

In legal filings, Murrill claims that the policy — which the state characterizes as a so-called “sanctuary city” policy — is in direct conflict with a newly passed state law that requires state and local law enforcement agencies to cooperate with federal immigration agencies.

“The consent decree now sits fundamentally at odds with state law as applicable to immigration detainers,” Murrill said in court documents filed Friday.

A federal court will now determine whether to allow the state of Louisiana to join a 2011 federal suit that resulted in the policy and whether to throw out the policy altogether. A hearing has been set for April 30.

The state’s campaign against “sanctuary” policies comes as President Donald Trump is pushing local law enforcement agencies to join the federal government in his promised immigration crackdown. Since his inauguration, Trump has ordered the U.S. Department of Homeland Security to push for more partnerships between local law enforcement units and federal immigration agencies. A few have already signed up. Louisiana Gov. Jeff Landry, a longtime immigration hardliner and Trump ally, has worked with Republican lawmakers in the state to enact laws that encourage those collaborations.

As attorney general, Landry criticized a policy adopted by the New Orleans Police Department, under a long-running federal consent decree that blocks officers from enforcing immigration laws.

Neither Murrill’s office nor representatives for U.S. Immigration and Customs Enforcement responded to requests for comment.

In court filings, Murrill said Hutson “does not oppose the (state’s) intervention” in the case.” But a spokesperson for Hutson said that’s not exactly true. “It’s more accurate that we take no position regarding the state intervention,” a Sheriff’s Office spokesperson said in an emailed statement on Wednesday.

While she has not taken a position for or against increased collaboration with ICE, in an interview with Fox 8 in December, Hutson noted that the jail’s resources were far too stretched to take on immigration enforcement.

The sheriff’s policy stems from a 2013 federal court settlement in a civil rights case involving two New Orleans construction workers picked up on minor charges in 2009 and 2010. Mario Cacho and Antonio Ocampo sued after they were allegedly illegally held in the city’s jail past the completion of their sentences. The two were held at the request of U.S. Immigration and Customs Enforcement. The agency issues such “detainer” requests to local law enforcement agencies, asking them to hold onto arrestees who are suspected of immigration violations. Local agencies are only supposed to honor the hold requests for 48 hours, after which they should let detainees free. But in 2009 and 2010, then-Sheriff Marlin Gusman detained Cacho and Ocampo for months, according to legal filings in their case against the office.

Ocampo and Cacho settled the case with the Sheriff’s Office in 2013, and Gusman agreed to adopt a new policy on immigration investigations. The resulting policy blocks the agency from investigating immigration violations and from detaining immigrants for ICE without a court order, except in certain cases where they are facing charges for a small number of serious violent crimes.