Munk Senior Fellow Laura Dawson talks to BNN Bloomberg on US President Donald Trump’s announcement that Canada, along with Mexico and the European Union, will no longer be exempted from tariffs on imported steel and aluminum.

“I don’t think it’s a bluff,” said Dawson. “We’re coming into the congressional mid-terms and he wants the demonstration effect for his rust belt constituents that he’s doing something.” But she also noted that “Canada is not in this alone.”

Another factor that Dawson raises is Trump’s use of the national security exemption, which she says is very dangerous: “if you use it, everybody else is going to use it.”