Major stock indexes were slightly lower on Friday as U.S. President Donald Trump's announcement of tariffs on imports from Canada fanned worries about trade tensions, with the Canadian dollar down against the greenback.

President Donald Trump says he's prepared to tariff and punish countries that challenge the U.S. dollar as the global reserve currency.

The U.S. dollar has firmed up against its major counterparts, as sentiment toward the greenback improved due to its safe-haven appeal amid the ongoing tariff uncertainties. The U.S. Dollar Index edged up 0.

President Donald Trump's antitrust enforcers recently cleared a string of multibillion-dollar deals in a week, demonstrating a willingness to settle with companies that marks a shift from the Biden administration.