Australian politics: Speculation Dutton to roll Turnbull

Pressure is mounting on Australia's prime minister, Malcolm Turnbull, with growing speculation he'll face a leadership challenge from his home affairs minister, Peter Dutton. Unease about Mr Turnbull's leadership is being driven by a constant string of polls showing the ruling coalition government trailing the opposition Labor Party. No Australian Prime Minister since John Howard lost the 2007 elections has managed to see out their team without being rolled in an internal coup. Political editor of The Australian, Dennis Shanahan talks to Guyon Espiner.