Record-breaking Olympian: Michael Phelps at press conference

An emotional Michael Phelps ends his record-breaking career after winning his 18th gold medal in the men's medley relay. Report by Sophie Foster. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn . Subscribe to ITN News! http://www.youtube.com/subscription_center?add_user=itnnews