Commonwealth Consolidated Acts

COMMONWEALTH OF AUSTRALIA CONSTITUTION ACT - SECT 18

    Before or during any absence of the President, the Senate may choose a senator to perform his duties in his absence.

19.   Resignation of senator.

    A senator may, by writing addressed to the President, or to the Governor-General if there is no President or if the President is absent from the Commonwealth, resign his place, which thereupon shall become vacant.