From 1963 to 1973, 128 nations received $2.5 trillion in weapons and services, the majority from the United States. Law only required that the Secretary of State report “significant” arms sales to Congress, semi-annually. In the early 1970s, legislators moved to become involved in deciding to whom arm sales could be made and under what circumstances. Concern over arms sales increased significantly in the summer of 1973, when news surfaced of a potential Nixon Administration sale of F-4 fighter-bombers to Saudi Arabia.