Prime Minister Malcolm Turnbull says his government supports the cut to Sunday penalty rates in retail and hospitality and will offer a view on how it should be phased in.
The Fair Work Commission is looking into how to bring in its decision to align weekend rates in hospitality, retail and fast-food industries, with Mr Turnbull backing a two-year time frame.
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"We do support it," he told 3AW's Neil Mitchell on Friday, confirming the government will be offering a submission to the commission.
Mr Turnbull insisted it wasn't a decision of his government, but rather the independent commission.
After listening to audio of a Labor party robocall claiming the cuts were the fault of the prime minister Mr Turnbull accused Bill Shorten of lying.
He cited Mr Shorten's admission to Mr Mitchell last year he would support the commission's decision even if it resulted in a reduction.
"He's the one that's broken his word and he's lying there," he said.
"(Mr) Shorten has no regard for the truth anymore than (ACTU secretary) Sally McManus has a regard for the law."
Mr Shorten hit back at Mr Turnbull, saying by choosing to vote against legislation to stop the penalty cuts he is adopting the decision.
"They are his cuts," he told reporters in Canberra.
