WHAT'S HAPPENING IN PARLIAMENT THIS WEEK?
* Speaker Tony Smith to issue writ on Monday for October 20 by-election in NSW seat of Wentworth, vacated by Malcolm Turnbull.
* Labor to pursue Home Affairs Minister Peter Dutton over his eligibility for parliament, but is awaiting coalition MP backing.
* Senate inquiry report due on Wednesday into Dutton's use of ministerial powers in relation to au pairs.
* Greens may seek parliamentary support for no confidence motion in Dutton.
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* Inquiry report due on Tuesday into the Trans-Pacific Partnership trade pact.
* Senate committee to report on Wednesday into the future of work and the "gig" economy.
* Senate to debate laws to crack down on tax avoidance, and a bill to ensure the ABC is "fair and balanced" and better covers rural and regional audiences.
* Senate to consider Labor bill expanding the Productivity Commission's functions to include researching inequality.
* Inquiry hearing on Tuesday into the controversial granting of $444 million to the Great Barrier Reef Foundation.
* Aged care standards expected to be key issue, following weekend announcement of a royal commission.
* Labor caucus and coalition joint party room to meet on Tuesday.
