Koo has said the agreements reached by the two sides in 1992 did not include the so-called "one China" principle that defines Taiwan as part of the Chinese state -- as Beijing has claimed.
The opposition has accused Chen of denying the "1992 consensus" because he is reluctant to conduct dialogue with China.
According to the KMT, the term "1992 consensus" summed up the content of an understanding under which both sides maintained different interpretations of the definition of "one China" and agreed not to challenge each other's interpretation.
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