David Warner has thrown his support behind Usman Khawaja's revelations about the 2018 ball-tampering scandal, calling his claims accurate. Warner also questioned the investigation into. David Warner breaks his eight-year silence, backing Usman Khawaja’s explosive claims about Australia’s 2018 Sandpapergate scandal. Former Australia cricketer David Warner on Wednesday backed Usman Khawaja’s fresh claims on Sandpapergate, saying the account in Khawaja’s upcoming autobiography Sabr was “100 per cent.