On a single day — October 12, 2011 — both the House and Senate approved three separate trade agreements with South Korea, Colombia, and Panama. These measures are three more in a series of "free-trade agreements" intended to transfer the power to regulate trade (and eventually other powers too) to super-national arrangements via a step-by-step process. NAFTA is a prime example of such an arrangement. So is the developing continental government now known as the European Union, which is an outgrowth of a free-trade arrangement once called the Common Market.
Agreements such as this one are intended to transfer trade (and other) powers to super-national arrangements binding the United States, despite the fact that under the Constitution only Congress has the power "to regulate commerce with foreign nations."