Kane, a member of the legislature of State, is prosecuted in federal court for a violation of the Federal Securities Act arising out of the activities of a state-owned corporation. Kane's defense includes a claim that the alleged wrongful acts were committed in the course of legislative business and are immune from scrutiny"Which of the following is the strongest constitutional argument supporting Kane?
Because of doctrines of federalism, federal law generally cannot be applied to state legislators acting in the course of their official duties.  State legislators enjoy the protection of the speech and debate clause of the United States Constitution. A federal court must follow state law respecting the scope of legislative immunity. To apply the Federal Securities Act to state legislators would violate the due process clause