US President Donald Trump will sign the new North American trade pact with Mexico and Canada next week, a White House official said Thursday. The USMCA, the fruit of years of negotiation between the three key trading partners, is billed as an update to the 1994 North American Free Trade Agreement, which Trump had long lambasted as a job killer and threatened to scrap outright. The US Senate approved the pact last week and White House officials said Trump will sign it Wednesday. The earlier NAFTA created a vast free-trade zone across North America, leading to radical shifts in the makeup of industries in the three countries and vastly increasing cross-border exchanges in goods, services and people.