Was interesting that Dutton said he thinks he knows who is doing the leaking.
There are plenty Liberal MP's that have a motive, Morrison & Bishop are both close to Turnbull and none of these 3 want to be back in opposition even though they could hold their seats.
All the back benches on marginal seats would be worried about losing their seats, the ones in safe seats just don't want to be in opposition.
I would say there is a number of people involved, makes little sense for one person to act alone.
