Mr Deputy President, I seek leave to make a brief statement.

Leave granted.

Today is the day the Greens have joined Labor's mining tax cover-up. Today is the day the Greens have put themselves right in front of Treasurer Swan and have protected him from releasing information which the Senate has insisted for the last 18 months needed to be provided so the Senate would be in a position to properly scrutinise the credibility of the mining tax revenue estimates and to properly scrutinise the credibility of the costings of all of the promises Labor has attached to the mining tax.

The government, of course, continues to refuse to release of the mining tax revenue assumptions. Why is that, Mr Deputy President? The reason for that is that the government clearly has something to hide.