King Charles is speaking in Canada today. Here's why it's not a normal royal visit — and what it has to do with Trump.

King Charles II will address Canada's Parliament on Tuesday, a rare gesture that comes as Canada grapples with tariffs and annexation threats by President Trump.

The British monarch, who formally serves as Canada's head of state, arrived in the capital of Ottawa on Monday, part of a two-day visit that's widely viewed as a form of pushback against Mr. Trump's calls to make Canada the 51st state.