Ted Cruz was on with Jeff Kuhner this morning and answered some tough questions about why he supports the TPA/TPP agreements. One of the questions was specifically about what Jeff Sessions has been saying about the trade deal and Cruz blatantly said that what Sessions has been saying is not accurate. In short, he said that the US is not ceding any sovereignty to any transnational commission, that it has no power to bind the US with any law or agreement.
The interview is 24 minutes long and I urge you to listen to the whole thing. But if you want to skip ahead to the Q&A about Jeff Sessions take on this, it begins around 16:10.
UPDATE: Also read here where Ted explains more thoroughly his position and answers questions like why TPP is not a ‘living document’.