The move means the case will be taken up by a 4-2 liberal majority if it reaches the court, which appears all but certain.

But several justices appeared to question SEIU Healthcare Wisconsin's argument that the law still applies to UW Hospital in light of Act 10.

The Act 10 law ushered in under former Gov. Scott Walker is at the heart of a case before the court on whether UW Health nurses can form a union.