sentences:  It then surveyed passport law and administrative policy and practice from 1835 to 1966, concluding that the history of passport controls since the earliest days of the Republic showed congressional recognition of Executive authority to withhold passports on the basis of substantial reasons of national security and foreign policy.It compared Congressional action and inaction concerning the broad rule-making authority granted in earlier Acts, concluding that there was "weighty" evidence of congressional approval of the Secretary's interpretation that it had been delegated the power to restrict passports on the basis of national security.The Court rejected Agee's argument that the only way the Executive could establish implicit congressional approval is by proof of longstanding and consistent enforcement of the claimed power.