Normally, Americans have to submit any agreements to the Congress for approval. I trust you as a negotiator on a personal level. If I saw that your mandate was to protect something important to me like supply management and if I saw that Canada was already benefiting from this—I don't know where the negotiations currently are—I may be in favour of this agreement.
That being said, I cannot endorse the agreement without reading it. I understand that those who would like to have access to the text need to sign a confidentiality agreement. That's probably how things are done in Europe, the U.S. or other countries.