One Nation leader Pauline Hanson is threatening to hold the government's $50 billion corporate tax cut plan to ransom, saying her party will withhold their crucial Senate crossbench votes until the Queensland sugar dispute is resolved.
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The challenge in the final sitting week before the budget follows Monday's Fairfax-Ipsos poll showing 44 per cent support for the tax cuts, a 10-year plan to reduce the big business tax rate from 30 per cent to 25 per cent by 2026-27.
The plan was a centrepiece of Coalition's 2016 budget and re-election campaign.
Senator Hanson restated her threat on Monday to not vote for any legislation before Parliament until the government resolved a three-year crisis over sugarcane supply contracts in Queensland's Burdekin region, south of Townsville.
The Singapore-owned conglomerate Wilmar, which bought CSR Sugar's mills six years ago, is seeking control over marketing as well as milling, while growers want flexibility to use a single-desk system.
The One Nation leader has previously ruled out doing deals to progress or block government legislation, including the reintroduction of the building industry watchdog.
"I don't do horse-trading," she said in October.
The government had been expected to secure support for a cut for companies with a turnover of up to $10 million from One Nation and the Nick Xenophon Team, while other Senate crossbenchers have indicated they could move up to $50 million.
Labor will back a cut only for companies with a turnover of up to $2 million, while the Greens do not support the lowering of the rate from 30 to 27.5 per cent.
One Nation's growing influence has put Coalition MPs, including local Liberal-National backbencher George Christensen, under pressure.
Senator Hanson blamed the ongoing stalemate on Prime Minister Malcolm Turnbull and his deputy and Nationals leader Barnaby Joyce.
She told the Seven Network on Monday the situation was a headache in north Queensland, where growers had "their backs to the wall".
"This has been going on for nearly two years now, especially since the end of last year, Barnaby Joyce promised the cane growers it will be fixed by Christmas last year and nothing has been done," she said.
She said Mr Joyce was "crazy as bat-poo" for not standing up for growers, echoing his criticism of Senator Hanson's comments calling for a Muslim immigration ban.
Fellow Queensland One Nation senator Malcolm Roberts will join his leader in the planned blockade.
Treasurer Scott Morrison said work was ongoing, including with industry and the state government.
"I don't think Australians expect their parliamentarians to go on strike. I think they expect them to turn up to work and do the job," Mr Morrison told ABC radio.
Mr Morrison said One Nation was "a bit behind the play" on the dispute. He expected a draft agreement to be reached as soon as Monday.
