On one level continued investigations into donations made to New Zealand First, and how much leader Winston Peters knew about them will dominate much of the interest in Parliament.
But business will continue in the House with the contentious emissions trading scheme legislation set to pass today.
Other legislation the Government wants passed this week includes the Waste Minimisation Bill and the Public Transport Management Bill.
New Bills would be introduced to Parliament this week but they would proceed through to a select committee rather than being rushed through the system.
On the ground floor of Bowen House wealthy Labour Party benefactor Owen Glenn is due to appear before the privileges committee to defend his claim that Mr Peters personally solicited and thanked him for a donation of $100,000.
Mr Peters says that is not true and he is expected to appear before the committee tonight to comment on Mr Glenn's latest statements.
Under the Electoral Act, all donations above $10,000 must be declared but NZ First did not declare any donations above that level in the past three years.
Mr Glenn is also expected to tell the committee, chaired by National Party MP Simon Power, that unlike the claims made by some Labour Party MPs last week, he was not confused about dates and details of the donations.
Mr Glenn has been quoted as saying he will not help Labour's election campaign this year, depriving the party of the $500,000 he paid them in 2005.
The Electoral Commission was due to discuss yesterday what to do about NZ First's alleged breach of electoral law.
The commission received a letter from the party about its donation returns for 2005, 2006 and 2007 but would not give details of the letter.
The police will inquire into the allegations made against NZ First over its non-declaration of donations last year.
A complaint was laid by Act New Zealand leader Rodney Hide last week.
If the charges are proven against NZ First, the party's secretary Anne Martin could be fined up to $20,000, jailed for a year or both.
The Serious Fraud Office is also investigating donations to NZ First.
Prime Minister Helen Clark said yesterday she was making no assumptions about any of the inquiries under way and she had not heard whether she would be required to appear before the privileges committee.
She would not be meeting Mr Glenn as she made it her practice not to meet donors in person.
In the House, the National Party will try unsuccessfully to send the emissions trading legislation back to a select committee to correct "errors" it has identified.
National Party climate change spokesman Nick Smith said errors identified in the legislation in respect of co-generation and emissions from gas and coal bought through wholesalers exposed the Government's "reckless process" on the complex Bill.
"Government officials have accepted these errors affecting clauses 57 and 69 and schedules three and four of the Bill, and are now scrambling to find a way to make the corrections.
"The problem is that the opportunity for amending the Bill has passed, as only the title and third reading stages remain."
However, the Government has the numbers to pass its prized legislation through its final stages today and National's calls for the legislation to return to a select committee will fall on deaf ears.
Labour needs the legislation passed before the election as a cornerstone policy plank.
