Pan-Blue Coalition, although there were differences in the content of their criticism. Supporters of the Pan-Green Coalition tended to react angrily to the spirit and content of the law as an infringement of what they saw as Taiwanese sovereignty. By contrast, supporters of the Pan-Blue Coalition, while stating that they opposed the law and the threat of force against Taiwan, called for more dialogue with the PRC and pointed to parts of the law in which Beijing showed hitherto unseen flexibility. Opinion polls indicated widespread opposition to the law among the general public. Some questioned whether Beijing had the authority to enact such a law as they claim that Taiwan is not under the PRC jurisdiction (See Political status of Taiwan). The Pan-Green Coalition, in particular, reacted with distaste and there have been calls for an "anti-annexation law" to be passed by the legislature. Premier Frank Hsieh pointed out that the PRC law had already infringed on ROC sovereignty and thus met the criteria for initiating a "defensive referendum" under the ROC constitution. However, he added that whether a defensive referendum would be invoked is at the discretion of the ROC president. A protest march against the PRC law took place on March 26 and it was widely reported that one million Taiwanese participated in the protest. Both the former President Lee Teng-hui and President Chen Shui-bian joined the march. However, Chen Shui-bian announced in advance that he would only attend the march and wouldn't be giving a speech. Most politicians from the Pan-Blue Coalition did not participate in any protest march, although they claimed that they would not dissuade their supporters from attending if they wished. The turnout of the march became a subject of political debate in Taiwan, with the mayor of Taipei city, Ma Ying-jeou, downplaying the participant number to around 270,000, while the march organizers claimed that the goal of one million participants was reached. On March 25, 2008, DPP legislators tabled a bill titled the "Anti-Annexation Peace Law" at the procedural committee level in the legislature, which would have stated that "Taiwan and China are not subordinate to each other"; that "Taiwan is a sovereign state"; and that "the relationship between Taiwan and China is one between two states". It would have expressed hope that the Taiwan issue be resolved peacefully, but that if the status quo of the Taiwan Strait should change, the President