A reporter with China Daily raises a question during the news conference. [Photo by Zou Hong/China Daily]

Although most of their violations did not occur during their tenure as leading national political advisors, the cases have affected the image of the CPPCC, Lyu said.

The CPPCC would upgrade integrity overhaul and anti-corruption measures, he said.

"The anti-corruption campaign is what honest members of the Communist Party of China and the general public welcome and support, with which a victory would be achieved," he said.

The annual session of the CPPCC National Committee is scheduled to open on Tuesday.