In an interview with Anderson Cooper, leading Democratic presidential candidate Bernie Sanders criticizes how unprepared Michael Bloomberg was at last week's debate, and insinuates that President Trump would "chew him up and spit him out" if he were to win the nomination. The Dutch prosecutor investigating why a passenger jet was shot down over Ukraine in 2014 has brought murder indictments against three Russians and a Ukraine separatist, but as Scott Pelley reports, Russia won't turn them over. Sharyn Alfonsi shares the story of Matthew Whitaker, a blind pianist, whose talents were recognized at an early age. Those stories on tonight's "60 Minutes."See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.