The Supreme Court is letting stand a lower court's ruling barring Florida from enforcing a contentious immigration law that imposes criminal penalties against undocumented migrants who enter the state.

The Supreme Court on Wednesday refused to revive an aggressive Florida immigration law that had been blocked by lower courts.

Immigrants rights groups filed lawsuits on behalf of two unnamed, Florida-based immigrants living in the U.S. illegally, arguing that immigration is a federal issue beyond the power of the states.