US trade chief Greer aiming for 'interim arrangements' on USMCA by year end

He did not specify what separate "potential interim arrangements" would look like, but said he wanted to have options for Trump, Sheinbaum and Canadian Prime Minister Mark Carney to consider by the end of this year.

"I would love to have by the end of the year at least some arrangements — one with Canada, one with Mexico — and then some of these issues that are really important like rules of origin ... labor, environment ... take a little more time, to have more discussion of that, including with Congress, in the following year," he said.

Greer's comments signal that a full renegotiation of the trade pact — and more business and investment uncertainty — will bleed into next year, a fate that Canada and Mexico have been seeking to avoid.