Constitutionality of Legislative Provision Regarding ABM Treaty: Memorandum for the Counsel to the President [June 26, 1996] [open pdf - 35KB]
"There are serious doubts as to the constitutionality of a provision of a bill stating that the United States shall not be bound by any international agreement entered into by the President that would substantively modify the Antiballistic Missile Treaty [ABM] with the Soviet Union, including any agreement that would add other countries as signatories or convert that bilateral treaty into a multilateral treaty, unless the agreement is entered pursuant to the President's treaty making power. The provision intrudes on the Executive's exclusive constitutional powers to interpret and execute treaties and to recognize foreign States."
United States. Department of Justice: http://www.justice.gov/