Dziczek said she's anticipates a scenario where Trump signs a formal intent to withdraw, but ignores the fact that congressional approval would be required to repeal the underlying legislation that enforces the terms of the original agreement - a scenario she's dubbed "zombie NAFTA".
Trump's decision to set in motion a possible end to largely free trade in North America comes amid some scepticism from Democrats about the new trade deal.
Rep. Nancy Pelosi (D-Calif.), who is presumed to be the next speaker of the House of Representatives, indicated Friday that House Democrats weren't ready to give their support to this deal yet.
Canadian astronaut David Saint-Jacques set to launch into space
But today, everything went precisely according to plan, with an on-schedule and anomaly-free liftoff at 6:31 a.m. Saint-Jacques, 48, described the Soyuz spacecraft as "incredibly safe".
The US Chamber of Commerce said a year ago that exiting NAFTA without a new deal could devastate American agriculture, cost hundreds of thousands of jobs and "be an economic, political and national-security disaster". While Congress does need to approve the implementation of a trade deal, some experts say that the Trade Act of 1974 gives to president authority to pull out of such deals on his own.
Trump had vowed to revamp NAFTA during his 2016 presidential election campaign.
Morneau, speaking to a NY event arranged by Politico, also said it was clear that a negotiating process was starting in the United States which he hoped would lead to Congressional ratification of a new pact created to replace the North American Free Trade Agreement.
The three were still bickering over the finer points of the deal just hours before officials were due to sit down and sign it.
USA coalition 'targets ISIL chief linked to Peter Kassig killing'
A graphic video produced by ISIS terrorists in Syria released on November 16, 2014 claimed USA aid worker Kassig was beheaded. Interested in ISIS? Add ISIS as an interest to stay up to date on the latest ISIS news, video, and analysis from ABC News.
President Donald Trump, Canada's Prime Minister Justin Trudeau, right, and Mexico's President Enrique Pena Nieto, left, participate in the USMCA signing ceremony, Friday, Nov. 30, 2018 in Buenos Aires, Argentina.
"This new agreement will ensure a future of prosperity and innovation for Mexico, Canada, and the United States", Trump said before signing the USMCA on Friday.
Asked whether Canada took Trump's comments seriously, Morneau replied: "We take everything seriously".
Colorado diplomats remember President George H.W. Bush
Bush "was a great friend of Canada, and he made very important things possible for Canadian history", Mulroney said. Bush , who died late Friday , will be given a state funeral at the National Cathedral in Washington , D.C.