Senator FIFIELD (Victoria—Manager of Opposition Business in the Senate) (14:28): My question is to the Minister for Finance and the Minister representing the Treasurer, Senator Wong. I seek the minister's assistance in relation to the revenue raised by the MRRT. As a former senior adviser to the last Australian Treasurer to deliver a budget surplus— Government senators interjecting— The PRESIDENT: Order! This outburst is completely disorderly. Senator FIFIELD: I cannot recall a time when the then Treasurer did not actually want to know how much revenue each tax collected! But is the minister not aware that the law does authorise the disclosure of taxpayers ' information to a minister for the purpose of enabling that minister to exercise a power or to perform any function under tax law?