For many years, China has been the most important country to need an annual waiver to maintain free trade status. The REnunciation of the PRC had been in effect since 1980. Every year between 1989 and 1999, Congress introduced legislation that rejected the presidential waiver. The legislation had attempted to attach it to free trade with China on certain human rights conditions that go beyond freedom of emigration. All these attempts at the law have failed. The requirement for an annual waiver was at odds with World Trade Organization rules and, in order for the People`s Republic of China to join the WTO, an act of action by Congress was necessary to grant China a sustainable normal trade relationship (PNTR).  This was achieved in 2000 by the United States-China Relations Act of 2000, which allowed China to join the WTO in 2001.    China`s most favoured country (MFN) became permanent on 27 December 2001.  In January 2016, the National Manufacturers Association announced its support for the TPP and stated: “Without such an agreement, the United States would cede economic leadership to other world powers and make them set the rules for economic engagement in the region.”  Economists generally agreed that the U.S. economy as a whole benefited from NAFTA by increasing trade.
  In a 2012 survey by the Global Markets Initiative`s panel of economic experts, 95% of participants said that U.S. citizens benefited on average from NAFTA, while no one said that NAFTA was detrimental to U.S. citizens on average.  A review of the 2001 Journal of Economic Perspectives showed that NAFTA was a net benefit to the United States.  A 2015 study showed that welfare in the United States increased by 0.08% and intra-block trade in the United States by 41% due to NAFTA tariff reductions.  Michelle Ye Hee Lee, a fact auditor for The Washington Post, wrote that Warren used “misleading language” to describe the TPP. While Warren involved the creation of “28 commercial advisory committees” to influence the TPP, the advisory committees were effectively established under the Trade Act of 1974; Only membership of trade committees had changed during the Obama administration and the early phases of the TPP. Referring to Warren`s assertion that trade advisers “secretly whisper in the ears of our trade negotiators,” Lee wrote, “While direct meetings are held for private reasons, committees still have to submit written reports to Congress and written recommendations and advice to be published.  In addition, Lee wrote: “It is true that industry representatives represent a large part of overall membership, but it is interesting to note that there is a working committee at the second level, workers` representatives at the first level and that industry groups are highly concentrated (to give technical advice).”  However, Professor Marc L. Busch of Georgetown University and Professor Krzysztof J. Pelc of McGill University note that modern trade agreements are long and complex, as they often address non-tariff barriers, such as different standards and rules in addition to tariffs. As a result of the steady reduction of customs barriers since the Second World War, countries are increasingly facing trade barriers in the form of non-tariff barriers.