On AM: The Prime Minister Malcolm Turnbull has agreed to discuss the proposal for fixed four year parliamentary terms with Opposition Leader Bill Shorten; and a Four Corners investigation has found that a NSW loophole is allowing irrigators to divert billions of litres of water being returned to the environment, threatening the viability of the Murray Darling Basin Scheme. This is an early edition of AM. The complete 30 minute edition will be available for download at 9am.