President Joe Biden told ABC News he thought Russian President Vladimir Putin was a “killer.” Putin challenged the president to a one-on-one debate that would be broadcasted live. WATCH THE FULL EPISODE OF 'WORLD NEWS TONIGHT': https://bit.ly/3lvXXmL WATCH OTHER FULL EPISODES OF WORLD NEWS TONIGHT: http://abc.go.com/shows/world-news-tonight WATCH WORLD NEWS TONIGHT ON HULU: https://bit.ly/3iQLwPp #WorldNewsTonight #PresidentJoeBiden #VladimirPutin