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“We are having discussions around the interpretation of a variety of things,” said the Canadian source.

No one was immediately available for comment in the office of U.S. Trade Representative Robert Lighthizer, who led the negotiations for Washington.

Adam Austen, a spokesman for Foreign Minister Chrystia Freeland, said it “is normal after an agreement-in-principle is concluded for all countries to work together to ensure the text is accurate.”

As part of the USMCA, Canada agreed that British Columbia would stop its practice of only allowing local wines to be stocked in supermarkets.

The source said the United States was trying to broaden that clause to cover wine sales in the provinces of Ontario and Quebec. The two sides are also at odds over elements of Ottawa’s promise to offer more access to U.S. dairy producers.

(It) is normal after an agreement-in-principle is concluded for all countries to work together to ensure the text is accurate Spokesman for Foreign Minister Chrystia Freeland

The source said it was not abnormal that nations would seek to “push a little bit further in terms of the text” at this stage of a trade negotiation.

The USMCA must be ratified by all three nations before it comes into force. U.S. President Donald Trump had threatened to walk away from NAFTA unless major changes were made.

Another area of contention are the tariffs on Canadian steel and aluminum that Trump imposed in June.

Freeland told reporters at a steel plant in Hamilton, Ont. on Thursday that she would be meeting Lighthizer in the next few weeks to discuss the matter. She reiterated that Ottawa does not think the tariffs and the USMCA are connected.