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.

Canadian Prime Minister Mark Carney said his country would continue to work toward a new trade framework with the U.S.

The European Union (EU) is stuck in limbo as uncertainty persists around when a trade agreement with the U.S. might be reached.

The U.S. dollar rose against major currencies including the yen and euro as President Donald Trump rekindled trade tensions with new tariffs on Canada and other trading partners.

Flattery and pressure — coupled with President Trump’s growing dissatisfaction with President Vladimir V. Putin — have helped build momentum for new economic punishments.