The Sputnik crisis of 1957 led Eisenhower to create the President's Science Advisory Committee. Once that body was in place, Eisenhower began to directly receive a broader selection of scientific information; Strauss lost his ability to control scientists' access to the president and his influence within the administration began to recede. While Strauss had maintained his hostility towards Anglo-American cooperation on nuclear matters since becoming AEC chairman, Sputnik gave impetus to renewed cooperation on this front. Strauss visited Prime Minister Harold Macmillan to give a message from Eisenhower to this effect, and subsequent talks and hearings resulted in the 1958 US–UK Mutual Defence Agreement coming into place.