At least seven states, including Texas, Oklahoma and Iowa, have passed similar laws in recent years. All are blocked for now or have not yet taken effect.

Florida passed a law making it a crime for people in the U.S. illegally to enter the state. A federal judge said it's likely unconstitutional.

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.