Prime Minister Justin Trudeau is preparing for the possibility the U.S. may pull out of NAFTA. For Canadian companies, the trade skirmish has already begun.

The U.S. confirmed last week that among its top objectives in upcoming negotiations on the North American Free Trade Agreement — which superseded the FTA in 1994 — is the elimination of the Chapter 19 dispute-resolution mechanism that previous Canadian Prime Minister Brian Mulroney went to such lengths to preserve.