China said it would not be blackmailed and warned of retaliation after Trump vowed to slap a 10% tariff on $300 billion worth of Chinese imports from next month, sharply escalating a trade row between the world's biggest economies.

September futures on the S&P/TSX index were down 0.32% at 7:00 a.m. ET.

Canada's trade data is due at 8:30 a.m. ET

The Toronto Stock Exchange's S&P/TSX fell 29.52 points, or 0.18%, on Thursday to 16,377.04.

Canada's markets are closed on Aug.5 for Civic Holiday.

Dow Jones Industrial Average e-mini futures were down 0.23% at 7:00 a.m. ET, while S&P 500 e-mini futures were down 0.35% and Nasdaq 100 e-mini futures were down 0.63%.

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Restaurant Brands International Inc's quarterly profit beat analysts' expectations on Friday, as more diners visited its Burger King outlets, and investments made in international expansion paid off.

The Ontario Securities Commission has opened an investigation into CannTrust Holdings Inc, the cannabis producer said on Thursday, less than a month after the health regulator found unlicensed pot cultivation by the company.

Canadian miner Barrick Gold Corp said on Thursday it conveyed the need for a "partnership approach" for the future of the Porgera gold mine in Papua New Guinea, as the Pacific nation wants more benefits from the mine, for which Barrick is seeking a lease extension.

Canada's Brookfield Asset Management is in talks to acquire a 30% stake in Brazilian sanitation company Brookfield Ambiental from the workers severance fund FGTS, two people with knowledge of the matter said.