They suspected that Canada, which had said it wasn't bound by United States deadlines, was delaying the talks until after provincial elections Monday in Quebec, where support for Canadian dairy tariffs runs high.
They point to the rising trade tensions between the United States and China as the likely impetus behind the provision.
The President has admitted there was "a lot of tension" but said it didn't affect negotiations.
He confirmed that the United States sought assurances that the new proposed trade deal wouldn't leave a "back door" for other economies to come through Canada into North America.
Besides, he added, "Canada would not negotiate a deal that would threaten its access to the USA market".
Canada says its seafood will remain tariff free under the new trilateral trade deal with the United States and Mexico. However, Senate Finance Committee chairman Orrin Hatch has said the Senate "ought to move on NAFTA as soon as we can".
While the new United States-Mexico-Canada Agreement, or USMCA, avoids tariffs, it will make it harder for global automakers to build cars cheaply in Mexico and is aimed at bringing more jobs into the US.
Rather, the new agreement is being widely described as a "NAFTA-minus": a regime not as free as NAFTA had been, particularly in the automotive sector, but still very much in the interests of all three countries - and definitely better than no deal. It was unclear, however, whether Trump had authority from Congress to pursue a revamped NAFTA with only Mexico, and some lawmakers said they wouldn't go along with a deal that left out Canada.
"On Tuesday, all the rumblings were that Trump and Trudeau were going to meet at the General Assembly - in fact, senior-level USA officials were telling stakeholders that at private dinners, luncheons, receptions in Canada and the US", the source said.
He said the protections for Canadian dairy were necessary because otherwise Canada might've backed out of the deal.
That morning, before Trump's news conference, U.S. Ambassador David MacNaughton spoke at an event in Toronto with U.S. -based website Politico, where on a scale of one to 10, he put the chances of the two sides being able to reach a deal at "five".
Kara O'Connor, government relations director for the Wisconsin Farmers Union, said the small wins in Canada won't fix the underlying problem in the American dairy industry.
Under the new deal, a multitude of changes promise to shake up the manufacturing of vehicles across North America.
Marshall said the US had set the deadline to finalize its agreement with Mexico before the new Mexican administration takes over. And with that, after almost 14 months of tense negotiations, we now have a newly named regional trade agreement.
President Donald Trump reportedly accepted the new deal while Canadian Prime Minister Justin Trudeau held a late-night meeting with his Cabinet in Ottawa. "I think it'll pass easily, really easily, because it's a great deal", he said.
Lilly said if digital products fall outside the general exemption on cultural industries, it could limit Ottawa's ability to set Canadian content standards in digital media.