Australian Attorney-General George Brandis says former Guantanamo Bay detainee David Hicks posed no threat to him during a confrontation at an awards ceremony in Sydney.
He said he didn't even realise it was Hicks who was heckling him until told by a staff member later.
Others were more concerned that Hicks had been able to get so close to the nation's top law officer at the invitation-only Human Rights Commission event.
Read more: Ex-Guantanamo Bay detainee David Hicks heckles Australia's Attorney-General over CIA report
"My tax dollar has somehow funded an event where a terrorist has turned up and heckled the nation's attorney-general," National senator Barry O'Sullivan told a Senate committee hearing.