North Queensland knockabout MP Bob Katter is weaving another political twist in the push for a commission of inquiry into the banking industry.In an interview with Banking Day last night, Katter said that he and other cross bench members had approached high-profile World Vision advocate Rev. Tim Costello, to sound out his interest in being appointed to sit on the planned inquiry.Other prominent Australians have also been contacted, Katter said, without naming who they were.While Costello is probably best known as a public campaigner against the gambling industry, he has also been an active monitor of banking industry practices when he chaired National Australia Bank's defunct Social Responsibility Advisory Council. The advisory body folded in 2016.Katter said he believed all cross-bench members in the lower house were "lock-ins" to support a bill to establish the special banking inquiry, which he expects will be put to a vote in the second week of December.There has been speculation that Cathy McGowan, the independent member for the Victorian rural seat of Indi, might abstain in a vote to set up the commission of inquiry, but Katter said that was "claptrap"."I most certainly believe that the member for Indi has locked in her support for the commission of inquiry," he said."You wouldn't want to be running for a country electorate in Australia if you weren't prepared to support a commission of inquiry into banking."Katter said that crossbench members in the lower house have been consulting since the end of August on a strategy to get a commission of inquiry over the line.Katter also cast doubt on whether a private member's bill being drafted by Nationals senator Barry O'Sullivan would end up being the enacting legislation."The lower house cross benchers and Labor have told me they intend to support a bill that my office has drafted," he said.A spokesperson for cross-bencher Rebekha Sharkie said the South Australian MP was not across the details of O'Sullivan's bill and wasn't too concerned about whose bill set up the inquiry.Sharkie's spokesperson said the bill should ensure a judicial inquiry because that was the only way banks would be made to testify.It is not yet clear how O'Sullivan's planned inquiry would differ from Katter's proposal.If Katter is right, and the Labor opposition decides to run with his bill, directors and senior executives at Australia's major banks can expect expansive terms of reference."We [the cross bench MPs] believe the terms of reference should be so wide it covers everything," he said."It won't only be including banking and finance but also life insurance as well."Katter's draft bill would establish an 11-person commission of inquiry.Nine members would be appointed by parliament and the remaining two positions nominated by the Turnbull government.However, even if both houses pass Katter's or O'Sullivan's bill, constitutional lawyers say that the commission of inquiry could go nowhere for the duration of the current parliament. That's because the final step in the process to activate the commission of inquiry requires the Governor-General's assent.Neither parliament nor the speaker of the