sentences:  Only when Congress had maintained its silence in the face of a consistent and substantial pattern of actual passport denials or revocations - where the parties will presumably object loudly, perhaps through legal action, to the Secretary's exercise of discretion - can this Court be sure that Congress is aware of the Secretary's actions and has implicitly approved that exercise of discretion.The decision also relied on the very Executive construction and policy deemed irrelevant in "Kent".The Court's reliance on material expressly abjured in "Kent" was understandable only when considering the paucity of recorded administrative practice - the only evidence upon which "Kent" and "Zemel" permit reliance - with respect to passport denials or revocations based on foreign policy or national security considerations relating to an individual.