From what I understand, only certain members of congress have access to it before it is finalized.
"Congress, and the American public, will be fully informed of what’s in the Trans-Pacific Partnership before lawmakers vote to make the agreement part of United States law. But he has a point that lawmakers won’t know what’s in the Trans-Pacific Partnership before they cast a separate, precursor vote -- the vote to authorize Obama to negotiate the Trans-Pacific Partnership on a fast-track basis in the first place."
"Congress, and the American public, will be fully informed of what’s in the Trans-Pacific Partnership before lawmakers vote to make the agreement part of United States law. But he has a point that lawmakers won’t know what’s in the Trans-Pacific Partnership before they cast a separate, precursor vote -- the vote to authorize Obama to negotiate the Trans-Pacific Partnership on a fast-track basis in the first place."
http://www.politifact.com/truth-o-meter/statements/2015/apr/...