National procedures for ratifying the agreement in the United States are governed by the legislation of the Trade Promotion Authority, which is also known as the fast-track authority. The formal negotiation process began on May 18, 2017, when the USTR announced to Congress that it wanted to renegotiate NAFTA starting at 90 days.  In accordance with the trade promotion authority`s statutes, the USTR published its document on the main objectives of the negotiations on 7 July 2017. Negotiations began on August 16, 2017 and continued until April 8, 2018. Without a solution, Lighthizer said on May 2, 2018, that negotiations would be suspended until 2019 until 2019 if no agreement was reached at the end of the month. This statement was justified by the impending change of government in Mexico, during which the then President, Andres Manuel Lopez Obrador, did not agree with much of the negotiated language and was perhaps unwilling to sign the agreement. The North American Labour Cooperation Agreement (NAALC) came into force in January 1994. It is one of two parallel agreements to the North American Free Trade Agreement between the United States, Canada and Mexico. The agreement is managed by the Commission for Professional Cooperation, composed of a Council of Ministers and a trinational secretariat, based in Washington D.C. Currently, four provinces (Quebec, Alberta, Manitoba and Prince Edward Island) are signatories to NAALC through an intergovernmental agreement. In Canada, the Office for Inter-American Labour Cooperation acts as a Canadian NAO within the Labour Branch of Human Resources and Skills Development Canada. The Canadian NAO also provides for the filing and receipt of public communications (complaints) on labour law issues that arise in the territory of another contracting party and serves as the official auditing body in Canada.
On June 1, 2020, the USTR Office issued the uniform rules which are the last hurdle before the implementation of the agreement on July 1, 2020. On December 2, 2018, Mr. Trump announced that he would begin the six-month process of exiting NAFTA, adding that Congress must either ratify the USMCA or return to trade rules before NAFTA.