Crossbenchers are voicing their support for extra parliamentary sitting days ahead of the budget and election in the wake of the release of the banking royal commission's final report.

Key points: Crossbench MPs Sharkie, Wilkie, Phelps, McGowan and Bandt would support a push to increase sitting days

Crossbench MPs Sharkie, Wilkie, Phelps, McGowan and Bandt would support a push to increase sitting days Leader of the House Christopher Pyne has dismissed Labor's demands

Leader of the House Christopher Pyne has dismissed Labor's demands The Opposition has called for an investigation into whether the banking royal commission findings were leaked

The Federal Government has promised to act on Commissioner Kenneth Hayne's 76 recommendations, but Labor leader Bill Shorten has urged the Coalition to schedule more sitting days to ensure there is enough time to deal with any legislation.

The 2019 sitting calendar has been a contentious issue since it was released last year, with the Federal Opposition slamming the Government for pencilling in less than two weeks before the early budget on April 2.

Given the election must be held by May 18, Prime Minister Scott Morrison would have to kickstart the election campaign shortly after, leading to accusations the Government is seeking to avoid scrutiny and any test of its authority on the floor of parliament.

Crossbench MPs Rebekha Sharkie, Andrew Wilkie, Kerryn Phelps, Cathy McGowan and Adam Bandt all voiced support for any motion to force more sitting days into the calendar, and Bob Katter said he was open to the idea and would discuss it with his colleagues.

The Coalition remains unmoved, despite its lack of a majority on the floor of the House of Representatives.

"The Government will not be changing the sitting calendar," Leader of the House Christopher Pyne told the ABC.

"If Labor were serious about reforming the financial sector they should vote for the legislation that's in the Senate this sitting week coming up, and we'd be able to reform superannuation next week.

"The Government is taking action on all 76 of Commissioner Hayne's recommendations."

Labor calls for leak investigation

The debate over more sitting days to deal with the banking royal commission's findings comes as Labor also demands an investigation into whether its final report was leaked early.

The Federal Government released Commissioner Hayne's report at around 4:20pm on Monday, after the share market had closed.

But Shadow Financial Services Minister Clare O'Neil has written to the head of the Prime Minister's Department to investigate whether it remained under lock and key until then.

A lock-up for media and other interested parties to pour over the report under embargo began at 1:00pm Canberra time on Monday.

"At approximately 11:00am on Monday traders plunged half a billion dollars into bank shares; an investment which turned a $22 million profit within just 24 hours, thanks to the unexpected increase in the value of bank shares when the market reopened on Tuesday morning," Ms O'Neil wrote to Dr Parkinson on Wednesday.

"Given that the lock-up commended at 1:00pm — two hours after this activity on the ASX — and the Hayne report was in strictly limited circulation for a number of days within the Government prior to its official publication, I ask that you investigate whether information was leaked by a Ministerial Office, a Minister or a member of the Australian Public Service prior to its publication."

Some have suggested the banks got off fairly lightly from the royal commission's final report, despite the damning testimony heard during the hearings.

On Monday night, Treasurer Josh Frydenberg was asked about the activity on the market and whether the big banks got a briefing that morning.

"Absolutely not. There was a lock-up and there were security guards around Parliament House," he told the ABC's 7:30 program.

"There was obviously Treasury officials and it was very, very closely monitored.

"The only people who were allowed into the lock-up were stakeholders and, when it came to the banking industry, it was by their representative body and, of course, senior journalists."