The NSW Liberal Party won't confirm whether Premier Dominic Perrottet told them about the Nazi costume during his preselection vetting process in 2010. Key points: The NSW Liberal Party says the nomination process is confidential The NSW Liberal Party says the nomination process is confidential Political Science professor Dominic O'Sullivan says the incident raises questions about the vetting process Political Science professor Dominic O'Sullivan says the incident raises questions about the vetting process Premier Dominic Perrottet has repeatedly apologised for wearing a Nazi costume in 2003 They also won't confirm if an investigation is underway, telling the ABC "the nomination...