A group of legal experts said it will file lawsuits with district courts across the country, arguing that the newly enacted security laws violate the Constitution.

Nearly 300 lawyers support the move and the first of the lawsuits could come as early as this spring, the group said Monday. The laws, which expand the overseas role of the Self-Defense Forces, were enacted in September amid fierce public opposition.

Many scholars as well as a former chief justice of the Supreme Court have criticized the legislation, a major shift in postwar security policy, as violating the war-renouncing Constitution.