Under Illinois law, you may have a claim for defamation if you can prove that someone made a false statement about you. This article explains the perils of doing so.First of all, you can't sanction opposing counsel, only the Court can "sanction. " Next, you don't "have" the preponderance of evidence. Sure, if someone is engaged in defamation, slander or libel, you can always file a suit. The question is always what your damages would be.