Lyndon Johnson actually said...
I, through my duly empowered representative, have entered into a trade agreement with the United Kingdom entitled the 'Interim Agreement Between the United States and the United Kingdom Relating to the Renegotiation of Schedule XX (United States) to the General Agreement on Tariffs and Trade'
Context
Proclamation 3712—Proclamation of Trade Agreement with United Kingdom Providing Compensatory Concessions
04/04/1966