Senator BRANDIS (Queensland—Deputy Leader of the Opposition in the Senate) (14:35): Mr President, I ask a supplementary question. Given that the introduction of the carbon tax is just another broken promise in the litany of broken promises from this government, including the broken promise to preserve defence spending, the broken promise to retain the private health insurance rebate, the broken promise on gambling reform and the backflip on offshore processing that has so offended the Greens, why should anybody believe anything this Prime Minister or any minister in this government says?