The Transatlantic Trade and Investment Partnership (TTIP) would be the biggest bilateral trade deal in history.
It is likely to result in the erosion of environmental and social regulations and make privatisation of public services much more difficult to reverse.
However the most controversial element of the TTIP are Investor State Dispute Settlements (ISDS). If implemented, this would allow US companies to sue EU governments (or EU companies to sue the US government) for taking action which could result in a reduction in their future profits.
We discuss these issues and many more in our series of features on TTIP below.