Wall Street's main indexes opened lower on Friday as President Donald Trump cranked up his tariff assault on Canada, deepening uncertainty around Washington's trade agenda.

Stocks are opening higher on Wall Street as the Trump administration seeks to win more deals with global trading partners.

Eastern time, the benchmark S&P 500 was up 0.3%, the Dow Jones Industrial Average rose 0.2%, and the Nasdaq Composite was 0.6% higher.

While tariffs are a tangible worry for investors, something far more nefarious (and important) can weigh on the stock market.

Wall Street looked to keep momentum from a tech-fueled rally that saw Nvidia leap to become the world's first $4 trillion public company.

The Dow Jones chalked in a gain on Thursday, clawing back the early week’s losses and putting the major equity index back on the high side heading into the tail end of the trading week. The Dow is still holding steady near the 44,700 level, with bullish momentum poised to take another fresh crack at all-time highs just north of 45,000.

Stock futures are holding steady Thursday morning as investors keep close tabs on developments related to tariffs.