‘You’ve just assaulted me’: Peter Costello accused of ‘violent behaviour’ by News Corp journalist

Video shows The Australian's Liam Mendes fall to the ground during encounter with Nine Entertainment chairman at Canberra airport

Peter Costello, the former federal treasurer and current chairman of Nine Entertainment, has been accused of assaulting a journalist from The Australian newspaper as he refused to answer questions about the embattled media company.

But Costello has dismissed the allegations, saying there was no assault" and that the journalist fell over an advertising placard".