After U.S. President Donald Trump took office in January 2017, he sought to replace NAFTA with a new agreement, beginning negotiations with Canada and Mexico. In September 2018, the United States, Mexico, and Canada reached an agreement to replace NAFTA with the United States–Mexico–Canada Agreement (USMCA), and all three countries had ratified it by March 2020. NAFTA remained in force until USMCA was implemented. In April 2020, Canada and Mexico notified the U.S. that they were ready to implement the agreement. The USMCA took effect on July 1, 2020, replacing NAFTA. The new law involved only small changes.