PBS NewsHour - Season 41 Episode 78

Tuesday on the NewsHour, presidential front-runners hope for big gains in the New York primary. Also: Taliban violence continues in Afghanistan, how the U.S. is supporting Iraq against ISIS, what winning New York means for the candidates, safe water is no safe bet for some U.S. schools, Lesbos braces for economic hardship and inside the Washington Post’s Pulitzer-winning police shootings database.