Opposition Leader Tony Abbott says if Labor and the Greens have really broken up, the government should ditch the policies the minor party foisted on it.

That would mean dumping the carbon tax - or supporting the coalition's efforts to do so - and returning to Howard-era asylum seeker policies.

"They say it's all over but the product of this political alliance is still with us," he told John Laws on 2SM Radio on Thursday.

"By all means say we don't like each other any more.

"But if you're fair dinkum get rid of the carbon tax ... (and) return to the border protection policies that worked rather than the `if you can get here you can stay here' policies which the Greens have foisted on this government."

The opposition leader dodged three questions about whether he'd rather deal with Julia Gillard or Kevin Rudd as Labor leader.

Both of them had strengths and weaknesses, Mr Abbott said.

"I don't really think it's my job giving public advice to the Labor Party when it comes to their own leadership," he said.