Opposition immigration spokesman Scott Morrison says the federal government has lost control of Australia's borders, the nation's budget and themselves.
Mr Morrison said an Auditor General's report, released this week, showed a budget blowout of almost $1 billion in the cost of contracting companies to supply services at Australian detention centres.
The blowout means the government will spend almost $2.5 billion this year managing those who come to Australia by boat, Mr Morrison told reporters in Sydney on Saturday.
"Labor have lost control of our borders, they've lost control of the budget and they've lost control of themselves."
He said he was also concerned about Treasurer Wayne Swan's suggestion that government spending will fall by $1 billion next year.
"What is concerning about this figure is not just the size of the blowout but it is the preposterous suggestion by the treasurer that next year, the budget will actually fall by a billion dollars and over the forward estimates it will fall by $2 billion."
"This is the scale of the fiscal ineptitude," he said.
Mr Morrison took another swipe at the treasurer for the lower than expected returns from the mining tax.
"The treasurer banks and budgets on winning the lottery and then blames the lottery when his books don't balance."
Mr Morrison has also called on his ministerial counterpart, Brendan O'Connor, to explain what was happening at the Manus Island detention centre in Papua New Guinea.
He is seeking an explanation as to how 20 people were able to escape from the detention centre and how a detention centre worker, who is now in isolation in a Sydney hospital, contracted tuberculosis.
"The minister needs to explain how this came about," he said.