MADISON, Wis. — The Wisconsin Supreme Court has agreed to hear three cases stemming from a John Doe investigation of fundraising and spending by Gov. Scott Walker's campaign and conservative groups backing him.

The court on Tuesday accepted a legal challenge from two targets of the probe; a separate lawsuit from those two targets and another; and an action by special prosecutor Francis Schmitz to try to reinstate subpoenas that were quashed by the judge overseeing the investigation.

The Milwaukee Journal Sentinel (http://bit.ly/1ADrlZ7) reports the court put off accepting a fourth lawsuit by a group challenging the campaign finance laws that are at the heart of the investigation.

The court would likely hear arguments in the coming months and issue a decision by summer.