A judge is weighing a critical legal question in the case of a man who confessed to killing one of the nation's few late-term abortion providers: Can the man claim at his trial that the slaying was justified to save the lives of unborn children?

Scott Roeder, a 51-year-old Kansas City, Mo., man, is charged with one count of premeditated, first-degree murder in Dr. George Tiller's death and two counts of aggravated assault for allegedly threatening two ushers during the May 31 melee in the foyer of the doctor's Wichita church.