Cross-border sweet talk could save NAFTA. br br Government officials and trade groups in Canada and Mexico hope US governors and mayors can thwart President Trump’s vow to unravel the free-trade pact. br br Canadian Prime Minister Justin Trudeau told the National Governors Association meeting in Rhode Island on Friday that “NAFTA isn’t perfect” — but should be “updated and modernized” — not tossed. br br Mexico City Mayor Miguel Ángel Mancera also attended the meeting. br br The US, Canada and Mexico will begin renegotiating the pact in August.