The Fraser Anning defection follows weeks of tension with Pauline Hanson and her adviser James Ashby, and a bitter clash at the One Nation party meeting on Monday morning.
Whichever major party 'wins' the Queensland election will likely be forced into tricky negotiations with minor parties to form government.
The question will now be whether Section 44 of the Constitution needs reform to enable dual citizens who may have a lot to offer to become MPs.
The High Court was unanimous on its decision in all the cases, with the eligibility of five MPs rejected and two upheld.
For Malcolm Turnbull, on a wafer-thin majority and struggling in the polls, the outcome of the seven High Court cases is of vital importance.
Michelle Grattan speaks to Deep Saini about campaigning during the same-sex marriage postal ballot and Tony Abbott's continued undermining of the government.
The High Court has set hearing dates of October 10, 11 and 12 for MPs' dual citizenship cases.
The government has asked the High Court to hear the dual citizenship cases of several current and former MPs on September 13-14.
The High Court ruling over the five MPs' legitimacy to hold seats may hang on whether they took reasonable steps to renounce their non-Australian citizenships.
Pauline Hanson is set to move that the High Court consider the eligibility of her One Nation senator Malcolm Roberts.
Three years ago The Australian newspaper launched a broadside at the Bureau of Meteorology. But when it did it again this week, it seemed to get less traction from the top echelons of government.
Even if Matt Canavan survives, his immediate absence from cabinet is a blow to Barnaby Joyce.
Federal Labor is pushing hard on James Ashby. A prime motive is embarrassing the Coalition over preferences, ahead of the Queensland election, and the later federal one.
David Leyonhjelm's complaint over being called an 'angry white male' could showcase the difficulty in launching a successful action under Section 18C and undermine an argument in support of repeal.
One Nation Senator-elect Malcolm Roberts lauds Galileo as a hero who turned scientific consensus on its head. But the 'Galileo gambit' is just one weapon in the climate conspiracists' arsenal.
Section 18C is limited in scope, and it would thus be wrong to claim that free speech carte blanche is under threat.
Contrary to the claims of One Nation Senator-elect Malcolm Roberts' that climate change is not happening, there is abundant evidence it is, but it might not be enough to persuade him.