REDWOOD CITY — Fighting malpractice and breach-of-duty claims, lawyers for McDermott Will & Emery told a state judge Wednesday the law firm should be permitted to contest a federal judge’s 2012 finding that it improperly represented clients with adverse interests.

San Mateo Superior Court Judge Marie Weiner seemed inclined to agree. That would be a defeat for MotionPoint Corp., a former McDermott client, which is seeking a court order barring McDermott from relitigating issues already decided by the federal court.