Attorney General Jeff Sessions on Monday released final guidance that calls on the Justice Department to withhold grants from certain “sanctuary” city jurisdictions, in a bid to crack down on cities and jurisdictions that refuse to follow federal requests to detain illegal immigrants.

In a memo released Monday afternoon, Sessions said he and Department of Homeland Security Secretary John Kelly have decided that a sanctuary jurisdiction will refer “only to jurisdictions that ‘willfully refuse to comply with 8 U.S.C. 1373.'”