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.

The president said the blanket 35% would be on top of tariffs on certain sectors. That’s higher than the previous 25% rate.

Canada faces another set of tariffs in its ongoing trade talks with the U.S. However, in this latest round of tariff announcements, investors have learned to largely tune them out as negotiating bluster rather than policy commitments.

President Trump’s ever-swerving tariff regime has taken more sharp turns in recent days.On July 7, his administration pushed back some of its most punishing duties by three more weeks to August, following a 90-day delay.

Trump's tariffs have companies scrambling as they navigate cost increases. Here are the companies that have talked about hiking prices.

President Donald Trump’s threat to boost import taxes by 50% over Brazilian goods could drive up the cost of breakfast in the United States.

President Donald Trump late Thursday threatened a 35% tariff on goods imported from Canada, a dramatic escalation in an on-again, off-again trade war with America’s northern neighbor and one of its most important trading partners.

U.S. President Donald Trump's threat of a 50% tariff on copper imports is raising alarm in the U.S. auto sector, as it could make it even harder for carmakers and suppliers to absorb border taxes and rising costs,