The Trump administration’s budget proposal contains a change in federal rules aimed at pressuring so-called sanctuary cities into helping enforce federal immigration laws, according to a new report.

According to the proposal, jurisdictions that do not hold people in jails at the federal government’s request will risk losing millions of dollars in grant money, The Wall Street Journal reported Tuesday.

The budget language reportedly mandates that jurisdictions hold suspected undocumented immigrants in jails for up to 48 hours.

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The proposal is aimed at helping Immigration and Customs Enforcement have more time to get such individuals for possible deportation. State and local governments that do not comply may lose grant funds from the Departments of Homeland Security and Justice.

Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE on Monday released a memo that did not mention detainers but did offer a definition for "sanctuary jurisdictions."

The definition states that “sanctuary jurisdictions” will be those that “willfully refuse to comply” with a federal law requiring federal, state and local government agents to share individuals’ immigration status with immigration authorities.

Sessions said in the memo that jurisdictions that match his definition will be ineligible for grants from Homeland Security or Justice.