<page_title> 45th Parliament of Australia </page_title> <section_title> Membership changes after the election </section_title> <table> <cell> WA (Senate) <col_header> Seat </col_header> <col_header> Member </col_header> </cell> <cell> Chris Back <col_header> Before </col_header> <col_header> Party </col_header> </cell> <cell> Liberal <col_header> Before </col_header> <col_header> Type </col_header> </cell> <cell> Resignation <col_header> Change </col_header> <col_header> Date </col_header> </cell> <cell> 31 July 2017 <col_header> Change </col_header> <col_header> Date </col_header> </cell> </table>
31 July 2017: Liberal Senator Chris Back of Western Australia resigns.