Senator MARIELLE SMITH (South Australia) (14:00): My question is to Senator Birmingham, the Minister representing the Prime Minister. Yesterday, when asked whether the Morrison government will commit to the Murray-Darling Basin Plan in full and on time, Senator Ruston said: There are many people who have made many comments … but that doesn't change the commitment of this government to remain absolutely focused on the delivery of the Murray-Darling Basin Plan. Given your coalition colleagues have today sought to prevent all water buybacks and block the return of the 450 gigalitres of water to our rivers, can the minister confirm that not all members of the coalition share that commitment? The PRESIDENT: Before I call Senator Birmingham—on my right, I have asked repeatedly for silence during questions. There was murmuring across the chamber. I'd appreciate that not occurring during questions.