Rebel government politicians in Australia have vowed to force a powerful inquiry into the country's scandal-hit banking sector, further turmoil for Prime Minister Malcolm Turnbull as he languishes in the polls amid a citizenship crisis.
The threatened move is a major embarrassment for Mr Turnbull,who has already rejected public and opposition calls for such an inquiry, and an unpalatable prospect for the country's Big Four banks who hold a combined A$3.6 trillion (€2.32 trillion) in assets.
The banks have already faced a grilling in recent months by cross-party parliamentary committees over scandals including providing misleading financial advice, insurance fraud and rate-rigging.
But the probe being pushed by a handful of conservative government politicians would turn up the heat on the banks, with the power to compel executives to testify, to demand documents and to recommend both prosecutions and new legislation.
"It's time for these people to have their day in court,"government Senator Barry O'Sullivan, a member of the junior coalition partner, the National Party, told Australian Broadcasting Corporation Radio.
Mr O'Sullivan's planned private member's bill to establish a so-called Commission of Inquiry into the banks has the support of the main opposition Labour Party and smaller Greens Party to pass swiftly through the Senate.
In the lower house, where Mr Turnbull lost his majority last month when deputy leader Barnaby Joyce was ejected from parliament because of his dual citizen status, the bill will require two members of the Liberal-National Party coalition to cross the floor.
One Nationals politician plans to cross the floor, while another was considering the move, their offices told Reuters.
Mr O'Sullivan said at least two other government politicians had indicated their support privately to him.
Australian Bankers Association Chief Executive Anna Bligh said the banks were already in the process of making amends for previous mistakes and an expensive government-funded inquiry was unwarranted.
Mr Turnbull's office said his position had not changed.
Australia and New Zealand Banking Group Ltd (ANZ) told Reuters it had hired lawyers.
National Australia Bank Ltd (NAB), Westpac Banking Corp, and Commonwealth Bank of Australia had also hired law firms, The Australian newspaper reported.
All three declined to comment on the matter when contacted by Reuters.
ANZ and NAB earlier this month agreed to pay A$50 million each to settle interest rate-rigging cases. Westpac is contesting the same allegations.