I think at this moment—and this could be said about the U.S.-Colombia free trade agreement—you have substantial leverage prior to entering into an agreement to try to encourage the other country to live up to its legal obligations under the FTA. Once the FTA is ratified, there's usually a reluctance on the part of the governments to vigorously enforce labour clauses once the agreement is in force. I think withholding, in the U.S. context, the FTA with Colombia created substantial leverage, which over time led to the ability to negotiate a pretty extensive—not perfect, but extensive—labour action plan that the Colombian government is moving to implement, again not fully, and certainly with issues.
But in the case of U.S.-Jordan, just signing the agreement did not lead to worker rights being respected. It was only after a major exposé in The New York Times and a trade complaint against Jordan that we began to see some progress being made.