A ”secondary agreement” reached in August 1993 on the application of existing domestic labour law, the North American Convention on Labour Cooperation (NAALC) , was severely restricted. With regard to health and safety standards and child labour law, it excluded collective bargaining issues, and its ”control teeth” were only accessible at the end of a ”long and painful” dispute.  The obligations to enforce existing labour law have also raised questions of democratic practice.  The Canadian anti-NAFTA coalition Pro-Canada Network suggested that guarantees of minimum standards in the absence of ”extensive democratic reforms in the [Mexican] courts, unions and government” would be of no use.  However, subsequent evaluations indicated that NAALC`s principles and complaint mechanisms ”created a new space for princes to form coalitions and take concrete steps to articulate the challenges of the status quo and promote the interests of workers.”  If the original Trans-Pacific Partnership (TPP) were to enter into force, existing agreements, such as NAFTA, would be reduced to provisions that do not conflict with the TPP or require greater trade liberalization than the TPP.  However, only Canada and Mexico would have the prospect of becoming members of the TPP after U.S. President Donald Trump withdrew the United States from the agreement in January 2017. In May 2017, the remaining 11 members of the TPP, including Canada and Mexico, agreed to pursue a revised version of the trade agreement without U.S. participation.  NAFTA was the world`s largest free trade agreement when it was established on January 1, 1994. NAFTA was the first time that two industrialized countries had signed a trade agreement with an emerging country. In October 2017, in The Globe and Mail in Toronto, an op-ed questioned the U.S.
willingness to renegotiate the agreement or whether it planned to do so, no matter what, and noted that the newly appointed U.S. Ambassador, Kelly Knight Craft, is married to the owner of Alliance Resource Partners, a major U.S. coal company. Canada is implementing a carbon plan, and it is also about selling bomber jets. ”Americans used so many poison pills in last week`s conversations in Washington that they should have been charged with murder,” columnist John Ibbitson wrote.  In early 2020, the U.S. Congress approved the USMCA with large bipartisan majorities in both chambers, and the agreement came into effect on July 1.