The new North American trade agreement - which the U.S.is calling the United States-Mexico-Canada Agreement, while the Canadian government is referring to it as the Canada-United States-Mexico Agreement - was reached in late September after a big push from the USA president to get the deal done before the midterm elections and before incoming Mexico President Andrés Manuel López Obrador officially took office December 1.
The deal will require ratification by all three countries' legislatures before taking effect.
Friday's signing ceremony is a crowning moment for Trump, who loves to tout his deal-making prowess. After the signing, USA trade chief Robert Lighthizer told reporters that negotiations are ongoing but that they see the tariffs as successful policy, CBC reported.
Rota told CKAT that Canada's big concern is the tariffs on aluminum and steel which haven't been lifted yet by the U.S.
There is no formal meeting between Trump and Trudeau on either leader's schedule for the Friday and Saturday summit.
"As is always the case ... with these agreements, there are always details to be finalized and we are very hard at work doing that", Freeland said in televised remarks.
There are a few areas still to iron out.
"This new agreement will ensure a future of prosperity and innovation for Mexico, Canada and the United States", the president said. Mexico swiftly retaliated with import tariffs on some U.S. goods, including steel, apples and pork.
"A vast number of technical details need to be scrubbed and wrapped up", she added.
Friday marked an important deadline for the trade pact. 'The fact that this is an agreement in three languages adds to the level of technical complexity and it is on that level that we are just being sure that all the Is are dotted and all the Ts are crossed'.
The USMCA - which overhauls the rules covering more than $1.2 trillion in regional commerce - faces major hurdles next year in Congress, where Democrats will control the House and may be reluctant to help Trump to fulfill a 2016 campaign promise.
'President Trump spoke with Canadian Prime Minister Trudeau this morning, ' spokesman Hogan Gidley said in a statement.
He described General Motors' plant closures that had hit thousands of United States and Canadian families as a "heavy blow".
Trudeau's readout on the same call also mentioned lifting the tariffs the USA imposed on steel and aluminum.
USMCA, which was finalized last month, replaces the North American Free Trade Agreement (NAFTA), which had been repeatedly criticized by Trump as being unfair to Americans and the country's industry. 'The Prime Minister also reinforced the importance of both countries lifting the tariffs on steel and aluminum'.
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