Authorities thwarted an alleged school shooting in Washington state, arresting a 13-year-old boy. Trevor Ault reports as police say they found an arsenal of weapons in his home. https://abcnews.link/zLCp8dH | ABC World News Tonight with David Muir

HAPPENING NOW: Officials in Memphis, Tennessee hold a news conference after President Trump said Friday that he will send National Guard troops to the city as part of his push to combat crime. https://abcnews.go.com/Politics/trump-hell-send-national-guard-memphis-combat-crime/story?id=125509847 | ABC World News Tonight with David Muir