Representing the United States is Heinz, which put 700 Canadian workers out of work in 2014 when it closed a plant in Canada’s tomato capital, a small southern Ontario town called Leamington. Representing Canada is French’s, the mustard-maker, which began producing ketchup in Canada after the Heinz closure.

The Supreme Court has upheld President Donald Trump's ban on travel from several mostly Muslim countries, rejecting a challenge that it discriminated against Muslims or exceeded his authority.