Senator WONG (South Australia—Leader of the Opposition in the Senate) (14:04): Mr President, I ask a supplementary question. I again refer the minister to the backgrounding by senior ministers against Holden, the most recent of which was reported today. Given that Mr Macfarlane has asked the media to identify the sources of the backgrounding, has the Prime Minister taken steps to identify those responsible? What steps has the Prime Minister taken? Honourable senators interjecting— The PRESIDENT: Order! The minister is entitled to be heard in silence. Opposition senators interjecting— The PRESIDENT: Silence on my left! I call the minister.