Curiously, Senator Bernardi did not charge taxpayers for any of his own travel or allowances – which he typically does when he is on electorate business – but his spokesperson says he was in Port Lincoln from June 3 to 9.

"You are clearly unaware that Port Lincoln is part of the senator's constituency and a major regional centre; it is in an integral part of his role to travel the length and breadth of the state," the spokesperson said.

"On occasions his family will meet him which is in accordance with the provisions of his employment."

The spokesperson urged Fairfax Media to be "more open-minded and sensitive to the demands of active senators".

Senator Bernardi has charged taxpayers to take family members to Port Lincoln on at least two other occasions – in February 2014 at a cost of $1899 and in June 2010 at a cost of $2400, including his own expenses.