Franklin Roosevelt actually said...
I am glad to have received the assurance expressed in your note to me of this date that it will be the fixed policy of the Government of the Union of Soviet Socialist Republics to respect scrupulously the indisputable right of the United States to order its own life within its own jurisdiction in its own way.
Context
Communications between the President Franklin D. Roosevelt and Maxim Litvinov of the Union of Soviet Socialist Republics
11/15/1933