President Donald J. Trump rose to power on a wave of anti-immigrant, nationalist sentiment. He wove a narrative of “bad” Mexicans, immigrants flooding over the border, bringing with them drugs and guns. And he used the case of Kate Steinle — a 32-year-old white woman shot and killed on a San Francisco pier by a Mexican National — to help sell the story.  As the Kate Steinle murder trial begins in San Francisco, KQED reporters unpack the facts and falsehoods surrounding her tragic death.