To try to strengthen West German confidence, ACDA director William C. Foster met with Chancellor Kiesinger, who expressed concern about the danger of “erosion” and “uncertainty” in U.S.-West German relations and the need for more time for consultations. Kiesinger’s “own idea was that it would have been better …to have discussed all aspects of non-proliferation ‘behind locked doors’ before any intention of signing the treaty had become public.”