Entire cabinet backed 2014 budget: PM

Malcolm Turnbull has refused to disown the Abbott government's badly-received first budget, telling parliament the whole cabinet gave it support.

Mr Turnbull was responding to his first question in parliament as prime minister, after Opposition Leader Bill Shorten asked if he still supported "unreservedly and wholeheartedly" every element of the 2014 budget.

"When the leader of the opposition invites me to sit here and unilaterally disown one policy or another, he demonstrates that he fails to understand that cabinet ... is a collective method of making decisions," Mr Turnbull said.