Labor will formally decide its position on the same-sex marriage plebiscite at a meeting of Opposition MPs tomorrow.
Legislation setting up the potential national vote is due for debate in the House of Representatives after that meeting.
There, Labor will get a chance to, once again, outline the arguments against it.
Opposition Treasury spokesman Chris Bowen says there are deep concerns about the plebiscite.
"I imagine Bill Shorten will make a recommendation to the caucus. We've been listening. We've been going through it. It's no secret that we are deeply concerned. The reasons are multiple, whether it's the cost, which is a concern, whether it's the impact on the wellbeing of young Australians in particular."
Labor is also concerned the nearly $200 million plebiscite could become a diversion from other important referendum questions such as the recognition of Indigenous people.
Special Minister of State Scott Ryan has told Sky News, if Labor blocks the plebiscite, the Government is prepared to shift its focus to other election commitments.
"If Bill Shorten says he doesn't want to deal with this issue, then, quite frankly, there are lots of other priorities the Government took to the election. I, myself, have some in my own portfolio. I will have made all good faith endeavours to implement this election commitment, and I'll move on to implementing my others."
In other parliamentary matters, bad behaviour by the nation's biggest banks is also expected to stay in the spotlight this week.
Labor is promising to keep up its calls for a royal commission.
Independent MP Bob Katter says he backs the move, and he is expected to introduce legislation for such an inquiry.
Finance Minister Mathias Cormann has told Sky News Labor is pursuing a political strategy entirely focused on its political self-interest.
"We don't support a banking royal commission, because we think it would recklessly and irresponsibly undermine the confidence in our banking system without actually achieving anything beneficial for bank customers with legitimate grievances. We are focused on taking action to resolve issues where they occur while preserving, of course, the fundamental importance, which is a strong and stable banking system."
Prime Minister Malcolm Turnbull has promised to establish a tribunal to give customers legal recourse if they cannot resolve their issues with the banks.
Labor says that is just a stunt and a diversion that will not really help.
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