Representatives from the US, Canada, and Mexico entered the fourth round of negotiations for NAFTA reforms on Wednesday, and with Trump’s tough position on the pact, an agreement that satisfies all parties seems less likely than ever. In the past few weeks, the Trump administration has met with US business who are supportive of NAFTA, pushing for serious reforms to the pact that Canada and Mexico vehemently oppose. Trump has continued to threaten to pull the US out of the agreement throughout the negotiations, which he has famously described as “the worst trade deal in history”.
See "Trump’s Tough Talk on Nafta Raises Prospects of Pact’s Demise", Ana Swanson, New York Times, October 12, 2017