King Charles is set to address the opening of Canada’s new parliamentary session today, marking the first time a British monarch has delivered the speech since 1977. The address takes place as US President Donald Trump continues to suggest that Canada could become the 51st American state.

The speech is expected to draw close scrutiny, especially on sovereignty and trade amid Trump’s annexation rhetoric and imposition of tariffs.

President Donald Trump’s threats to annex the largest of Charles’s realms has thrust the monarch into a difficult diplomatic maelstrom.