King Charles III is not just monarch of the United Kingdom, he is also the putative ruler of 14 other Commonwealth realms—including Canada. In that role, he paid a heavily freighted visit to his northern realm this week to deliver a message to the leader of the republic to the south.

King Charles III delivered a speech to Canada's Parliament on Tuesday, where he supported the country's sovereignty in the face of President Trump 's annexation threats. Why it matters: Charles' visit comes as American-Canadian relations have splintered because of Trump's repeated annexation threats and tariff policies.

King Charles visited Canada amidst calls from President Donald Trump that the U.S. should annex Canada. Chloe Kim. More Videos