Federal Rule of Appellate Procedure 29 governs the filing of briefs amicus curiae. That rule permits the United States, a federal officer or agency, or a state to file an amicus brief. Any other party may file an amicus brief only with the consent of all parties to the appeal, or with leave of court. A motion for leave to file must identify the interest of the movant and state why the filing of the amicus brief is desirable. It must also disclose whether the party's counsel authored the brief in whole or in part or funded preparing the brief. Rule 29 does not define the circumstances in which a court will grant leave to file an amicus brief. Seventh Circuit Rule 29 likewise, does not provide that guidance.