Usman Khawaja's explosive revelations in his autobiography have reopened the wounds of Australian cricket's Sandpapergate scandal, with David Warner publicly backing his former teammate and taking aim at captain Pat Cummins' response at the press conference. 

<p>Usman Khawaja's explosive revelations in his autobiography have reopened the wounds of Australian cricket's Sandpapergate scandal, with David Warner publicly backing his former teammate and taking aim at captain Pat Cummins' response at the press conference.&nbsp;</p>

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