Lyndon Johnson actually said...
I am going to sign this measure this morning notwithstanding the fact that it goes further than I was willing to ask for this year, because, paraphrasing what Secretary Rusk said the other day in response to a question from Congress, he said, 'Well, Senator, could it be that they could perhaps be wrong?'
Context
Remarks Upon Signing the 'Cold War GI Bill' (Veterans' Readjustment Benefits Act of 1966)
03/02/1966