Direct impact is limited; critics' concerns focus on China's reaction and whether this move portends broader protectionist actions in the future.

New U.S. national-security strategy portrays China as threat.

Canada and Mexico reject the U.S. hard line.

Canada and Mexico reject the U.S. hard line.

Economy minister says Mexico would accept U.S. proposal to review the agreement every five years.

Economy minister says Mexico would accept U.S. proposal to review the agreement every five years.

Protectionist shift hasnt damaged the two countries appeal.

U.S., Canada, and Mexico would promise to avoid devaluing their currencies for competitive purposes.