Wis. Stat. § 351.05
The court in which the petition under s. 351.027 is filed shall determine whether the person is a habitual traffic offender or repeat habitual traffic offender. If the person denies he or she was convicted or found in violation of any offense necessary for a holding that he or she is a habitual traffic offender or repeat habitual traffic offender, and if the court is not able to make the determination on the evidence before it, the court may certify the decision of the issue to the court in which the conviction or finding of violation was made. The court to which the certification was made shall conduct a hearing to determine the issue and send a certified copy of its final order determining the issue to the court in which the petition was filed.
Wis. Stat. § 351.05