That is something we have been pursuing for some time in various fora. Even before this NAFTA renegotiation began, we were trying to advance that proposal in various other discussions that we've had with the U.S. on government procurement initiatives, particularly their Buy American proposals. We have not had much success in convincing the U.S. to move away from “Buy American” to “Buy North American”, although, as you point out, we think it would be a far more efficient and effective approach that would provide greater benefits to both sides.
On December 4th, 2017. See this statement in context.