Canada's ambassador to the U.S. is downplaying signals from the Trump administration that it's considering breaking up the three-way North American free trade agreement into separate deals with Mexico and Canada.

Kirsten Hillman, who also serves as Canada's lead negotiator in trade talks with the U.S., said Thursday that the core rules of the Canada-U.S.-Mexico Agreement (CUSMA) apply to all three countries.

"There is an enormous foundation there that is trilateral, and I haven't heard any indication from the U.S. side that they want to change that foundation," Hillman told CBC's Katie Simpson in Washington on Thursday.

Hillman's comments come a day after U.S. Trade Representative Jamieson Greer floated the potential for separate trade deals with Canada and Mexico to replace CUSMA as

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