Canada and Mexico had both called for a 16-year renewal of the USMCA.
With the deal being subject to rolling negotiations instead of a longer-term extension, talks could last for months or years over everything from tariffs to trade rules governing specific sectors.
No Change to Day-to-Day Trade
Despite a 10-year countdown to the deal's expiration, the senior U.S. official said countries need not wait a decade to conclude their agreement.
"I think we need to come to a conclusion quickly, if possible," the official added.
Analysts say the development does not change day-to-day trade between the countries for now.
But Scott Lincicome of the libertarian Cato Institute told AFP that uncertainty could dampen business investment.
Still, he expects the USMCA to survive, with goods and services trade within North America amounting to nearly $2 trillion in 2024.
Even as Trump unleashed tariffs on virtually all trading partners in his second presidency, he made critical exemptions for USMCA products.
American Automotive Policy Council president Matt Blunt stressed Wednesday that "North American economic integration enables enormous competitive benefits for the region."
But Brian Bryant of the International Association of Machinists and Aerospace Workers union said the USMCA "should not simply be extended as-is."
He urged for tougher labor standards and "meaningful measures that discourage corporations from moving jobs out of the United States and Canada in pursuit of cheaper labor."
The United States and Mexico have held two rounds of bilateral trade talks and are due to hold a third in the week of July 20.
Mexico has been seeking to reduce U.S. tariffs on steel, aluminum and autos after Trump slapped sharp duties on steel, aluminum and copper imports.
While Greer did not unveil a schedule for formal talks with Canada, he has met with LeBlanc.
The USMCA was implemented in 2020, replacing NAFTA, the North American Free Trade Agreement that took effect in 1994.
It helped lower or remove tariffs and other trade barriers on many products traded between the three nations.
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