Which power allows the federal government to regulate immigration ?

The plenary and unqualified power of the federal government to regulate immigration, naturalization, and related foreign policy belongs to Congress.Explanation:

interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.