return criminal aliens to the state rather than turning over to federal authorities put the public safety at risk. san francisco's decision led to preventible and heartbreaking death of kate steinle. already taking aim at san francisco's position as sanctuary city. heard the president decry them numerous times in the campaign and since taken office. >> seen in the clip and spent time on the campaign trail. huge issue he brought up many times. >> reporter: it was. immigration was central issue when he entered the presidential race. campaigned on. when he learned kate steinle's story, something the president latched on to and used as example, rallying cry for tougher immigration policies throughout the presidential campaign. so we're waiting to see if the