In July 2015, Lee visited Japan, and again stated that Japan has full sovereignty over the Senkaku Islands. This was the first time Lee made remarks of this nature while in Japan. Members of the pan-Blue New Party and Kuomintang accused him of treason. New Party leader Yok Mu-ming filed charges of treason against Lee, while the KMT's Lai Shyh-bao called a caucus meeting to seek revisions to the Act Governing Preferential Treatment for Retired presidents and Vice presidents, aimed at denying Lee privileges as a former president.