(a) Disqualification on judge's initiative. A judge must withdraw from a proceeding whenever he or she considers himself or herself disqualified.

(b) Request for disqualification. A party may file a motion to disqualify the judge. The motion must allege grounds for disqualification, and include any appropriate supporting affidavits, declarations or other documents. The presiding judge must rule on the motion in a written order that states the grounds for the ruling.