Ambiga Sreenevasan has defended the Citizens' Declaration, vowing to soldier on in the wake of a scathing letter penned by jailed former opposition leader Anwar Ibrahim.

However, she declined to comment on the contents of the letter which described the Citizens' Declaration as being in principle, a document of Dr Mahathir Mohamad, was not in line with the reform agenda, and warned PKR leaders about the perils of working with the former premier.