Former prime minister Tony Abbott says the Government might need to compulsorily acquire the Liddell Power Station, but government backbencher Tim Wilson claims compulsory acquisition should only used in extreme and critical situations.

The University of Queensland's Professor Graeme Orr, claims High Court justices can hold dual citizens but parliamentarians cannot.

Premier Daniel Andrews says crime is down 10 per cent, but Opposition Leader Matthew Guy claims the rates of aggravated robbery, robberies, assault and aggravated burglary have all risen under Labor.

Top former bureaucrat Michael Keating, who argues Australia should lift taxes to avoid a budget blowout linked to the ageing population, claims the ratio of tax to gross domestic product is lower now than it was under the Howard Government.

Military leaders are arguing against posthumously promoting John Marshal, saying it would run contrary to Australian military tradition, but Opposition Leader Bill Shorten claims there are powerful precedents for such a decision.