Prime Minister Malcolm Turnbull says the onus is on Labor leader Bill Shorten to spell out the cost of his spending commitments.
Labor disagrees with the government's assessment that Mr Shorten has a budget blackhole of $67 billion that takes into account Labor's promises so far, government legislation it has blocked and measures it says it will overturn.
"There is a black hole, he can solve the mystery, he should spell it out," Mr Turnbull told reporters in Melbourne on Wednesday.
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