Episode 20

Matt Gutman has the latest on tens of thousands that are evacuating after a fire erupted near Castaic Lake, north of Los Angeles; Alex Perez has details on the 17-year-old boy that opened fire inside his Nashville area high school cafeteria, killing a 16-year-old student and wounding another student, according to police; Mary Bruce reports on the 1,500 additional troops Pres. Trump is deploying to the U.S.-Mexico border, after the president declared a national emergency; and more on tonight's broadcast of World News Tonight with David Muir.