The defence minister is being urged to haul backbencher Ed Husic into line after the Labor MP broke ranks to call for a rethink of the AUKUS nuclear submarine deal.
Mr Husic went public with his reservations about the pact following revelations Australia will only get second-hand submarines from the United States.
His comments follow Midnight Oil frontman and former Labor minister Peter Garrett announcing plans for an independent "people's inquiry" into the national security implications of AUKUS.
