This was obviously discussed ahead of him making that comment in public. There’s no reason Carney as PM should sit down with American invaders if they keep up with that rhetoric. It gives Carney the power to keep making trade agreements all over the world and if the US wants to discuss anything with him, they can fully stop the offensive rhetoric. If they don’t - fine. Carney doesn’t need to meet with them. Trump already tore up CUSMA. Trunp’s signature on agreements is already worthless. Carney has nothing to lose by not meeting with him.