Although President Chen has emphasized that all members of the Alliance can retain their original party affiliations, if a large number of KMT legislators defect to the DPP, and the long rumored split in the KMT becomes a reality, the establishment of the Alliance will nonetheless have a major impact in terms of realignment of political parties.
而如果大批國民黨籍立委「投奔綠營」，將使傳言已久的國民黨分裂傳言成真，所以雖然陳水扁總統強調國安聯盟成員將可維持原黨籍，國安聯盟的成立多少將對政黨政治生態有所衝擊。