Pakistan, June 29 -- President Donald Trump said Friday he is calling off trade negotiations with Canada in retaliation for taxes impacting US tech firms, adding that Ottawa will learn of their new tariff rate within a week.

Trump was referring to Canada's digital services tax, which was enacted last year and forecast to bring in Can$5.9 billion (US$4.2 billion) over five years.

While the measure is not new, US service providers will be "on the hook for a multi-billion dollar payment in Canada" come June 30, noted the Computer & Communications Industry Association recently.

The three percent tax applies to large or multinational companies such as Alphabet, Amazon and Meta that provide digital services to Canadians, and Washington has pre...