Paccar's commercial truck manufacturing plant in Sainte-Therese, Quebec is now down to around 500 workers from more than 1,000, according to Unifor. Photo by THE CANADIAN PRESS/Christinne Muschi

A United States-based truck manufacturer is laying off 300 workers at its plant in Sainte-Thérèse, Que., just days before U.S. tariffs on heavy-duty trucks take effect.

In October, U.S. President Donald Trump signed an executive orde r that places 25 per cent tariffs on medium- and heavy-duty trucks beginning Nov. 1.

Unifor, which represents workers at the Paccar Inc. plant in Quebec, issued a call for urgent action and reiterated its calls for a national industrial strategy that prioritizes support for domestic manufacturing plants.

It said Paccar has already done two rounds of layoffs

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