After their Oval Office encounter under the glare of the TV lights, Prime Minister Mark Carney and his U.S. counterpart retreated to the Roosevelt Room for a working lunch on Tuesday. Much of the mealtime chatter was about foreign policy issues,

Prime Minister Mark Carney arrived in Washington on Monday ahead of a meeting with U.S. President Donald Trump to talk trade and security, as the president shows no sign of letting up on comments about coveting Canada as a state.

Prime Minister Mark Carney did what he came to do in Washington on Tuesday—he reminded his counterpart to the south that Canada is a sovereign nation. But Donald Trump’s musings about taking over Canada (or Greenland,