From the Overview: "On November 30, 2018, President Trump and the leaders of Canada and Mexico signed the United States-MexicoCanada Agreement (USMCA). USMCA would revise and modernize the North American Free Trade Agreement (NAFTA), in place since 1994. Pursuant to trade promotion authority (TPA), the Administration notified Congress of its intention to enter into USMCA. [...] On December 13, 2019, the Trump Administration submitted to Congress the proposed USMCA implementing legislation. On the same day, the United States-Mexico Canada Implementation Act (H.R. 5430) was introduced in the House of Representatives. On December 16, the companion bill was introduced in the Senate (S. 3052). The House Ways and Means Committee approved the legislation on December 17, 2019, and the full House approved the bill on December 19, 2019, by a vote of 385-41. The Senate Finance Committee approved the legislation on January 7, 2020."
CRS In Focus, IF10997
Congressional Research Service: https://crsreports.congress.gov/