Fast Track, also known as Trade Promotion Authority (TPA), was used to pass the original NAFTA as well as the WTO and was renewed by Congress in 2015 when Obama was pushing for the TPP. Learn more from Public Citizen about this anti-democratic process that allows corporations to pass unjust trade deals through Congress with limited debate and without modification. The current Fast Track is authorized until July 1, 2021. Read the Congressional Research Service report to learn more.
Here are the next steps in the Fast Track process of NAFTA 2, now that the deal has been signed (as of Nov 30, 2018).