MPs will have 21 days to out themselves as dual citizens or face penalties under a proposal put forward by Prime Minister Malcolm Turnbull to bring the crisis plaguing his government to a conclusion. Labor leader Bill Shorten has indicated he will consider the plan, which is modelled on the often criticised parliamentary register of financial interests, and would force MPs to prove their compliance with the constitution. Fairfax reports the new system could be voted on by the Senate as soon as next week.

In a press conference yesterday afternoon, Turnbull conceded "there may well be a number of line-ball cases" that need to be referred to the High Court. "This is not an audit," he said.