Presidents Chiang Kai-shek and Chiang Ching-kuo have steadily maintained that there is only one China, the sole representative of which was the ROC, and that the PRC government was illegitimate, while PRC leaders have maintained the converse that the PRC was the sole representative of China. In 1979, Deng Xiaoping proposed a model for the incorporation of Taiwan into the People's Republic of China which involved a high degree of autonomy within the Chinese state, similar to the model proposed to Hong Kong which would eventually become one country, two systems. On 26 June 1983, Deng proposed a meeting between the Kuomintang and the Chinese Communist Party as equal political parties and on 22 February, he officially proposed the one country, two systems model. In September 1990, under the presidency of Lee Teng-hui, the National Unification Council was established in Taiwan and in January 1991, the Mainland Affairs Council was established; in March 1991, the "Guidelines for National Unification" were adopted and on 30 April 1991, the period of mobilization for the suppression of Communist rebellion was terminated. Thereafter, the two sides conducted several rounds of negotiations through the informal Straits Exchange Foundation and Association for Relations Across the Taiwan Straits.