The vote on the Canadian tariffs comes after Trump announced earlier this week that he's adding an extra 10% tariff on Canadian imports because a negative TV commercial from the Ontario government that featured a speech by former President Ronald Reagan in which he said tariffs hurt Americans long-term.

Senator Tim Kaine, Democrat of Virginia and the lead sponsor of the measures, said the votes are as much about the president’s overreach of power as they are about the economic impact of his sweeping...