President Donald Trump on Tuesday called on the Senate to keep the United States' tariffs on Canada in place -- hours before Democrats in the upper chamber could potentially force a vote aimed at blocking the president from imposing tariffs on the ally country.

U.S. President Donald Trump was poised to impose sweeping new reciprocal tariffs on global trading partners on Wednesday, upending decades of rules-based trade, threatening cost increases and likely drawing retaliation from all sides.