Trial is underway in Wisconsin for a judge accused of helping an immigrant evade federal authorities. Jurors settled into their seats for opening statements Monday.

Milwaukee County Circuit Court Judge Hannah Dugan was arrested by the FBI in April and charged in a two-count federal indictment, alleging she obstructed Department of Homeland officials and knowingly concealed a man from immigration authorities. She has pleaded not guilty.

Jury selection in the federal trial of Milwaukee County Judge Hannah Dugan begins Thursday. So how does federal court work?