The Supreme Court has refused to allow Florida to enforce an immigration law making it a crime for people who are living in the U.S. illegally to enter the state.

Washington — The Supreme Court on Wednesday left in place a block on a new Florida immigration law that imposes criminal penalties on migrants who are in the U.S. illegally and enter into the state, with the justices declining to pause a lower court decision that stopped it from taking effect while legal proceedings move forward.

The case, brought by immigrant advocacy groups, raises questions about whether and how states can police illegal immigration.