Nick McKenzie: Journalist says revealing truth about Australian SAS's Ben Roberts-Smith toughest assignment of career

Investigative journalist Nick McKenzie has called revealing the truth behind Australia's most decorated soldier the toughest assignment of his 21 year journalism career. Ben Roberts-Smith lost his defamation case against three newspapers who reported he had murdered civilians in Afghanistan. McKenzie was the first to report the story - and has now released his new book Crossing the Line. He told Mike Hosking no one - including himself - wanted to believe Roberts-Smith was a war criminal. But McKenzie says while it's weighed heavily upon him - his stress in exposing the story is nothing compared to what the S.A.S soldiers faced in standing up to Roberts-Smith. LISTEN ABOVESee omnystudio.com/listener for privacy information.