The Louth TD, who is facing mounting criticism over his handling of the case, has accused political opponents and the media of trying to bring him down.
"I have committed no offence," he said.
Earlier this month Adams's younger brother Liam was convicted of raping and sexually assaulting his daughter Aine over a six-year period from 1977 to 1983 when she was aged between four and nine.
This week the Northern Ireland Police Ombudsman Dr Michael Maguire confirmed his office had launched an investigation to establish whether or not detectives properly examined if Mr Adams hid the crimes of his paedophile brother.
The region's Public Prosecution Service and Attorney General are also looking at the case alongside the Police Service of Northern Ireland.