WASHINGTON — President Donald Trump said Wednesday that Canada would “cease to exist” if it weren’t for the United States — comments that came just days before Canadians are set to vote in an election dominated by Trump’s comments on the country’s economy and sovereignty.

Mark Carney’s Liberal Party is holding on to a narrow lead in opinion surveys with less than a week to go before Canada’s election, as US tariff threats remain a top issue in the campaign. Among decided voters,