Public Accounts Committee (PAC) Chairman Murli Manohar Joshi today dimissed allegations by former auditor R P Singh that he tried to influence the outcome of the 2G report as an attempt to malign the institutions of CAG and PAC. "R P Singh's allegations on 2G report are an attempt to malign Comptroller and Auditor General (CAG) and PAC by vested interests including the government," Joshi told reporters.