Cory Bernardi's Australian Conservatives joins a crowded field battling for the relatively small right-of-centre vote.
After all of the legal controversies of the past year we have ended up in essentially the same position – the Senate will include a One Nation senator from Western Australia, but not Rod Culleton.
The Rod Culleton saga still has some way to go before its conclusion. But it is almost certain that he will not be able to continue as a senator.
Elections worldwide are becoming increasingly dependent on technology. But, typically, the electronic systems adopted suffer from weak transparency and scrutiny even when the outcome is challenged.
The Turnbull government has finally passed its signature legislation to restore a tough watchdog in the construction industry.
George Brandis faces the second inquiry within months into his conduct.
Attorney-General George Brandis has pre-empted his opponents in the Senate by rescinding his controversial direction that all requests to the Solicitor-General for advice must go through him.
Hopes among Democrats of gaining a majority in the Senate were dashed. Here's what a narrow Republican majority might mean moving forward.
A Senate inquiry has called for Attorney-General George Brandis to be censured for misleading parliament.
Now that same-sex marriage will not be put to a national vote, it is up to the Prime Minister to ensure that marriage equality is written into law.
Pauline Hanson has backed the referral of her Western Australian senator Rod Culleton to the High Court to determine his eligibility to sit in parliament, declaring it a matter of integrity.
The departure of up to two crossbench senators and the uncertainty over who might replace them is giving the government fresh obstacles in their efforts to pass legislation.
Malcolm Turnbull laughs off the suggestion that this week's extraordinary developments mean the Senate is in chaos. Okay, let's humour the Prime Minister.
Further uncertainty has been thrown over the Senate crossbench, with the government now moving to have the High Court determine whether One Nation's Rod Culleton was ineligible for election.
Within hours of Bob Day submitting his Senate resignation on Tuesday, the government announced it would move for the High Court to rule on whether he had been ineligible to sit in the upper house.
The Senate has set up an inquiry into the treatment of asylum seekers and refugees on Nauru and Manus Island, to report by late March next year.
The Turnbull government was caught out by not having any legislation for the Senate to consider.
As the government hints the marriage equality plebiscite may be delayed until 2017, calls intensify for the parliament to legislate on the issue instead. So what is parliament's role here?
The returned Turnbull government can now add arguably one of the most diverse and potentially volatile senates ever to be elected in Australia to its list of political problems.
The new Senate is representative of the wide range of views in Australia – and far more so than the House of Representatives.