US expected to exit USMCA, starting a decade-long countdown for trade pact

US President Donald Trump’s administration is expected to formally declare on Wednesday that it will not extend the US-Mexico-Canada Agreement on trade, starting a decade-long clock to wind down the 32-year-old North American free-trade zone as the three countries haggle over proposed changes.
That declaration will kick off a six-year review session, part of a “sunset clause” negotiated by Trump’s first administration. However, it will do little to alter contentious negotiations over the pact’s...