In October 2011, the Congress and President Obama enacted into law the Colombia Trade Promotion Agreement, the South Korea–U.S. Free Trade Agreement, and the Panama–U.S. Trade Promotion Agreement using fast track rules, all of which the George W. Bush administration signed before the deadline. By 2013, the majority of United States free trade agreements were implemented as congressional-executive agreements. Unlike treaties, such agreements only require a majority of the House and Senate to pass. Under the TPA, Congress authorizes the President to negotiate "free trade agreements ... if they are approved by both houses in a bill enacted into public law and other statutory conditions are met."